We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
Is there a reason python-dateutil is pinned to v2.7.5?
In this [commit](https://github.com/spotify/luigi/commit/ca0aa9afedecda539339e51974ef38cecf180d4b), I can see that python-dateutil has been pinned to version 2.7.5 -  is this strictly necessary? Version 2.8.0 was released a couple of weeks ago and It's causing `ContextualVersionConflict` errors for us.



--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `setup.py`
Content:
```
1 # Copyright (c) 2012 Spotify AB
2 #
3 # Licensed under the Apache License, Version 2.0 (the "License"); you may not
4 # use this file except in compliance with the License. You may obtain a copy of
5 # the License at
6 #
7 # http://www.apache.org/licenses/LICENSE-2.0
8 #
9 # Unless required by applicable law or agreed to in writing, software
10 # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
11 # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
12 # License for the specific language governing permissions and limitations under
13 # the License.
14 
15 import os
16 import sys
17 
18 from setuptools import setup
19 
20 
21 def get_static_files(path):
22     return [os.path.join(dirpath.replace("luigi/", ""), ext)
23             for (dirpath, dirnames, filenames) in os.walk(path)
24             for ext in ["*.html", "*.js", "*.css", "*.png",
25                         "*.eot", "*.svg", "*.ttf", "*.woff", "*.woff2"]]
26 
27 
28 luigi_package_data = sum(map(get_static_files, ["luigi/static", "luigi/templates"]), [])
29 
30 readme_note = """\
31 .. note::
32 
33    For the latest source, discussion, etc, please visit the
34    `GitHub repository <https://github.com/spotify/luigi>`_\n\n
35 """
36 
37 with open('README.rst') as fobj:
38     long_description = readme_note + fobj.read()
39 
40 install_requires = [
41     'tornado>=4.0,<5',
42     # https://pagure.io/python-daemon/issue/18
43     'python-daemon<2.2.0',
44     'python-dateutil==2.7.5',
45 ]
46 
47 # Note: To support older versions of setuptools, we're explicitly not
48 #   using conditional syntax (i.e. 'enum34>1.1.0;python_version<"3.4"').
49 #   This syntax is a problem for setuptools as recent as `20.1.1`,
50 #   published Feb 16, 2016.
51 if sys.version_info[:2] < (3, 4):
52     install_requires.append('enum34>1.1.0')
53 
54 if os.environ.get('READTHEDOCS', None) == 'True':
55     # So that we can build documentation for luigi.db_task_history and luigi.contrib.sqla
56     install_requires.append('sqlalchemy')
57     # readthedocs don't like python-daemon, see #1342
58     install_requires.remove('python-daemon<2.2.0')
59     install_requires.append('sphinx>=1.4.4')  # Value mirrored in doc/conf.py
60 
61 setup(
62     name='luigi',
63     version='2.8.3',
64     description='Workflow mgmgt + task scheduling + dependency resolution',
65     long_description=long_description,
66     author='The Luigi Authors',
67     url='https://github.com/spotify/luigi',
68     license='Apache License 2.0',
69     packages=[
70         'luigi',
71         'luigi.configuration',
72         'luigi.contrib',
73         'luigi.contrib.hdfs',
74         'luigi.tools'
75     ],
76     package_data={
77         'luigi': luigi_package_data
78     },
79     entry_points={
80         'console_scripts': [
81             'luigi = luigi.cmdline:luigi_run',
82             'luigid = luigi.cmdline:luigid',
83             'luigi-grep = luigi.tools.luigi_grep:main',
84             'luigi-deps = luigi.tools.deps:main',
85             'luigi-deps-tree = luigi.tools.deps_tree:main'
86         ]
87     },
88     install_requires=install_requires,
89     extras_require={
90         'toml': ['toml<2.0.0'],
91     },
92     classifiers=[
93         'Development Status :: 5 - Production/Stable',
94         'Environment :: Console',
95         'Environment :: Web Environment',
96         'Intended Audience :: Developers',
97         'Intended Audience :: System Administrators',
98         'License :: OSI Approved :: Apache Software License',
99         'Programming Language :: Python :: 2.7',
100         'Programming Language :: Python :: 3.3',
101         'Programming Language :: Python :: 3.4',
102         'Programming Language :: Python :: 3.5',
103         'Programming Language :: Python :: 3.6',
104         'Programming Language :: Python :: 3.7',
105         'Topic :: System :: Monitoring',
106     ],
107 )
108
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/setup.py b/setup.py
--- a/setup.py
+++ b/setup.py
@@ -41,7 +41,7 @@
     'tornado>=4.0,<5',
     # https://pagure.io/python-daemon/issue/18
     'python-daemon<2.2.0',
-    'python-dateutil==2.7.5',
+    'python-dateutil>=2.7.5,<3',
 ]
 
 # Note: To support older versions of setuptools, we're explicitly not

{"golden_diff": "diff --git a/setup.py b/setup.py\n--- a/setup.py\n+++ b/setup.py\n@@ -41,7 +41,7 @@\n     'tornado>=4.0,<5',\n     # https://pagure.io/python-daemon/issue/18\n     'python-daemon<2.2.0',\n-    'python-dateutil==2.7.5',\n+    'python-dateutil>=2.7.5,<3',\n ]\n \n # Note: To support older versions of setuptools, we're explicitly not\n", "issue": "Is there a reason python-dateutil is pinned to v2.7.5?\nIn this [commit](https://github.com/spotify/luigi/commit/ca0aa9afedecda539339e51974ef38cecf180d4b), I can see that python-dateutil has been pinned to version 2.7.5 -  is this strictly necessary? Version 2.8.0 was released a couple of weeks ago and It's causing `ContextualVersionConflict` errors for us.\r\n\r\n\n", "before_files": [{"content": "# Copyright (c) 2012 Spotify AB\n#\n# Licensed under the Apache License, Version 2.0 (the \"License\"); you may not\n# use this file except in compliance with the License. You may obtain a copy of\n# the License at\n#\n# http://www.apache.org/licenses/LICENSE-2.0\n#\n# Unless required by applicable law or agreed to in writing, software\n# distributed under the License is distributed on an \"AS IS\" BASIS, WITHOUT\n# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the\n# License for the specific language governing permissions and limitations under\n# the License.\n\nimport os\nimport sys\n\nfrom setuptools import setup\n\n\ndef get_static_files(path):\n    return [os.path.join(dirpath.replace(\"luigi/\", \"\"), ext)\n            for (dirpath, dirnames, filenames) in os.walk(path)\n            for ext in [\"*.html\", \"*.js\", \"*.css\", \"*.png\",\n                        \"*.eot\", \"*.svg\", \"*.ttf\", \"*.woff\", \"*.woff2\"]]\n\n\nluigi_package_data = sum(map(get_static_files, [\"luigi/static\", \"luigi/templates\"]), [])\n\nreadme_note = \"\"\"\\\n.. note::\n\n   For the latest source, discussion, etc, please visit the\n   `GitHub repository <https://github.com/spotify/luigi>`_\\n\\n\n\"\"\"\n\nwith open('README.rst') as fobj:\n    long_description = readme_note + fobj.read()\n\ninstall_requires = [\n    'tornado>=4.0,<5',\n    # https://pagure.io/python-daemon/issue/18\n    'python-daemon<2.2.0',\n    'python-dateutil==2.7.5',\n]\n\n# Note: To support older versions of setuptools, we're explicitly not\n#   using conditional syntax (i.e. 'enum34>1.1.0;python_version<\"3.4\"').\n#   This syntax is a problem for setuptools as recent as `20.1.1`,\n#   published Feb 16, 2016.\nif sys.version_info[:2] < (3, 4):\n    install_requires.append('enum34>1.1.0')\n\nif os.environ.get('READTHEDOCS', None) == 'True':\n    # So that we can build documentation for luigi.db_task_history and luigi.contrib.sqla\n    install_requires.append('sqlalchemy')\n    # readthedocs don't like python-daemon, see #1342\n    install_requires.remove('python-daemon<2.2.0')\n    install_requires.append('sphinx>=1.4.4')  # Value mirrored in doc/conf.py\n\nsetup(\n    name='luigi',\n    version='2.8.3',\n    description='Workflow mgmgt + task scheduling + dependency resolution',\n    long_description=long_description,\n    author='The Luigi Authors',\n    url='https://github.com/spotify/luigi',\n    license='Apache License 2.0',\n    packages=[\n        'luigi',\n        'luigi.configuration',\n        'luigi.contrib',\n        'luigi.contrib.hdfs',\n        'luigi.tools'\n    ],\n    package_data={\n        'luigi': luigi_package_data\n    },\n    entry_points={\n        'console_scripts': [\n            'luigi = luigi.cmdline:luigi_run',\n            'luigid = luigi.cmdline:luigid',\n            'luigi-grep = luigi.tools.luigi_grep:main',\n            'luigi-deps = luigi.tools.deps:main',\n            'luigi-deps-tree = luigi.tools.deps_tree:main'\n        ]\n    },\n    install_requires=install_requires,\n    extras_require={\n        'toml': ['toml<2.0.0'],\n    },\n    classifiers=[\n        'Development Status :: 5 - Production/Stable',\n        'Environment :: Console',\n        'Environment :: Web Environment',\n        'Intended Audience :: Developers',\n        'Intended Audience :: System Administrators',\n        'License :: OSI Approved :: Apache Software License',\n        'Programming Language :: Python :: 2.7',\n        'Programming Language :: Python :: 3.3',\n        'Programming Language :: Python :: 3.4',\n        'Programming Language :: Python :: 3.5',\n        'Programming Language :: Python :: 3.6',\n        'Programming Language :: Python :: 3.7',\n        'Topic :: System :: Monitoring',\n    ],\n)\n", "path": "setup.py"}], "after_files": [{"content": "# Copyright (c) 2012 Spotify AB\n#\n# Licensed under the Apache License, Version 2.0 (the \"License\"); you may not\n# use this file except in compliance with the License. You may obtain a copy of\n# the License at\n#\n# http://www.apache.org/licenses/LICENSE-2.0\n#\n# Unless required by applicable law or agreed to in writing, software\n# distributed under the License is distributed on an \"AS IS\" BASIS, WITHOUT\n# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the\n# License for the specific language governing permissions and limitations under\n# the License.\n\nimport os\nimport sys\n\nfrom setuptools import setup\n\n\ndef get_static_files(path):\n    return [os.path.join(dirpath.replace(\"luigi/\", \"\"), ext)\n            for (dirpath, dirnames, filenames) in os.walk(path)\n            for ext in [\"*.html\", \"*.js\", \"*.css\", \"*.png\",\n                        \"*.eot\", \"*.svg\", \"*.ttf\", \"*.woff\", \"*.woff2\"]]\n\n\nluigi_package_data = sum(map(get_static_files, [\"luigi/static\", \"luigi/templates\"]), [])\n\nreadme_note = \"\"\"\\\n.. note::\n\n   For the latest source, discussion, etc, please visit the\n   `GitHub repository <https://github.com/spotify/luigi>`_\\n\\n\n\"\"\"\n\nwith open('README.rst') as fobj:\n    long_description = readme_note + fobj.read()\n\ninstall_requires = [\n    'tornado>=4.0,<5',\n    # https://pagure.io/python-daemon/issue/18\n    'python-daemon<2.2.0',\n    'python-dateutil>=2.7.5,<3',\n]\n\n# Note: To support older versions of setuptools, we're explicitly not\n#   using conditional syntax (i.e. 'enum34>1.1.0;python_version<\"3.4\"').\n#   This syntax is a problem for setuptools as recent as `20.1.1`,\n#   published Feb 16, 2016.\nif sys.version_info[:2] < (3, 4):\n    install_requires.append('enum34>1.1.0')\n\nif os.environ.get('READTHEDOCS', None) == 'True':\n    # So that we can build documentation for luigi.db_task_history and luigi.contrib.sqla\n    install_requires.append('sqlalchemy')\n    # readthedocs don't like python-daemon, see #1342\n    install_requires.remove('python-daemon<2.2.0')\n    install_requires.append('sphinx>=1.4.4')  # Value mirrored in doc/conf.py\n\nsetup(\n    name='luigi',\n    version='2.8.3',\n    description='Workflow mgmgt + task scheduling + dependency resolution',\n    long_description=long_description,\n    author='The Luigi Authors',\n    url='https://github.com/spotify/luigi',\n    license='Apache License 2.0',\n    packages=[\n        'luigi',\n        'luigi.configuration',\n        'luigi.contrib',\n        'luigi.contrib.hdfs',\n        'luigi.tools'\n    ],\n    package_data={\n        'luigi': luigi_package_data\n    },\n    entry_points={\n        'console_scripts': [\n            'luigi = luigi.cmdline:luigi_run',\n            'luigid = luigi.cmdline:luigid',\n            'luigi-grep = luigi.tools.luigi_grep:main',\n            'luigi-deps = luigi.tools.deps:main',\n            'luigi-deps-tree = luigi.tools.deps_tree:main'\n        ]\n    },\n    install_requires=install_requires,\n    extras_require={\n        'toml': ['toml<2.0.0'],\n    },\n    classifiers=[\n        'Development Status :: 5 - Production/Stable',\n        'Environment :: Console',\n        'Environment :: Web Environment',\n        'Intended Audience :: Developers',\n        'Intended Audience :: System Administrators',\n        'License :: OSI Approved :: Apache Software License',\n        'Programming Language :: Python :: 2.7',\n        'Programming Language :: Python :: 3.3',\n        'Programming Language :: Python :: 3.4',\n        'Programming Language :: Python :: 3.5',\n        'Programming Language :: Python :: 3.6',\n        'Programming Language :: Python :: 3.7',\n        'Topic :: System :: Monitoring',\n    ],\n)\n", "path": "setup.py"}]}