diff --git a/setup.py b/setup.py
index <HASH>..<HASH> 100644
--- a/setup.py
+++ b/setup.py
@@ -38,7 +38,7 @@ setup(
     author_email='fred@kanboard.net',
     license='MIT',
     packages=['kanboard'],
-    classifiers=(
+    classifiers=[
         'Intended Audience :: Developers',
         'Intended Audience :: Information Technology',
         'Natural Language :: English',
@@ -48,5 +48,5 @@ setup(
         'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
-    ),
+    ]
 )
Fix classifiers type in 'setup.py'

'setup.py' expects 'classifiers' to be of a 'list' type. As a 'tuple',
it gives this warning on 'python setup.py build':

    Warning: 'classifiers' should be a list, got type 'tuple'

This is documented in Python documentation:

> This field must be a list.

References:

 - <URL>