prompt: You will be provided with a partial code base and an issue statement explaining a problem to resolve.
  <issue>
  Need a .travis.yml file to properly run travis tests
  ^
  
  </issue>
  <code>
  [start of setup.py]
  1 # -*- coding: utf-8 -*-
  2 
  3 from setuptools import setup, find_packages
  4 
  5 
  6 with open('README.md') as f:
  7     readme = f.read()
  8 
  9 with open('LICENSE') as f:
  10     license = f.read()
  11 
  12 setup(
  13     name='viper',
  14     version='0.0.1',
  15     description='Viper Programming Language for Ethereum',
  16     long_description=readme,
  17     author='Vitalik Buterin',
  18     author_email='',
  19     url='https://github.com/ethereum/viper',
  20     license=license,
  21     packages=find_packages(exclude=('tests', 'docs')),
  22     install_requires=[
  23         'ethereum == 1.3.7',
  24         'serpent',
  25         'pytest-cov',
  26         'pytest-runner', # Must be after pytest-cov or it will not work
  27         #           due to https://github.com/pypa/setuptools/issues/196
  28     ],
  29     scripts=['bin/viper']
  30 )
  31
  [end of setup.py]
  </code>
  
  I need you to solve this issue by generating a single patch file that I can apply directly to this repository using git apply. Please respond with a single patch file in the following format.
  <patch>
  diff --git a/file.py b/file.py
  --- a/file.py
  +++ b/file.py
  @@ -1,27 +1,35 @@
   def euclidean(a, b):
  -    while b:
  -        a, b = b, a % b
  -    return a
  +    if b == 0:
  +        return a
  +    return euclidean(b, a % b)
   
   
   def bresenham(x0, y0, x1, y1):
       points = []
       dx = abs(x1 - x0)
       dy = abs(y1 - y0)
  -    sx = 1 if x0 < x1 else -1
  -    sy = 1 if y0 < y1 else -1
  -    err = dx - dy
  +    x, y = x0, y0
  +    sx = -1 if x0 > x1 else 1
  +    sy = -1 if y0 > y1 else 1
   
  -    while True:
  -        points.append((x0, y0))
  -        if x0 == x1 and y0 == y1:
  -            break
  -        e2 = 2 * err
  -        if e2 > -dy:
  -            err -= dy
  -            x0 += sx
  -        if e2 < dx:
  -            err += dx
  -            y0 += sy
  +    if dx > dy:
  +        err = dx / 2.0
  +        while x != x1:
  +            points.append((x, y))
  +            err -= dy
  +            if err < 0:
  +                y += sy
  +                err += dx
  +            x += sx
  +    else:
  +        err = dy / 2.0
  +        while y != y1:
  +            points.append((x, y))
  +            err -= dx
  +            if err < 0:
  +                x += sx
  +                err += dy
  +            y += sy
  +
  +    points.append((x, y))
       return points
  
  </patch>
golden_diff: diff --git a/setup.py b/setup.py
  --- a/setup.py
  +++ b/setup.py
  @@ -20,7 +20,7 @@
       license=license,
       packages=find_packages(exclude=('tests', 'docs')),
       install_requires=[
  -        'ethereum == 1.3.7',
  +        'ethereum==2.0.4',
           'serpent',
           'pytest-cov',
           'pytest-runner', # Must be after pytest-cov or it will not work
  
verification_info: {"golden_diff": "diff --git a/setup.py b/setup.py\n--- a/setup.py\n+++ b/setup.py\n@@ -20,7 +20,7 @@\n     license=license,\n     packages=find_packages(exclude=('tests', 'docs')),\n     install_requires=[\n-        'ethereum == 1.3.7',\n+        'ethereum==2.0.4',\n         'serpent',\n         'pytest-cov',\n         'pytest-runner', # Must be after pytest-cov or it will not work\n", "issue": "Need a .travis.yml file to properly run travis tests\n^\n", "before_files": [{"content": "# -*- coding: utf-8 -*-\n\nfrom setuptools import setup, find_packages\n\n\nwith open('README.md') as f:\n    readme = f.read()\n\nwith open('LICENSE') as f:\n    license = f.read()\n\nsetup(\n    name='viper',\n    version='0.0.1',\n    description='Viper Programming Language for Ethereum',\n    long_description=readme,\n    author='Vitalik Buterin',\n    author_email='',\n    url='https://github.com/ethereum/viper',\n    license=license,\n    packages=find_packages(exclude=('tests', 'docs')),\n    install_requires=[\n        'ethereum == 1.3.7',\n        'serpent',\n        'pytest-cov',\n        'pytest-runner', # Must be after pytest-cov or it will not work\n        #           due to https://github.com/pypa/setuptools/issues/196\n    ],\n    scripts=['bin/viper']\n)\n", "path": "setup.py"}]}