Add linter, solves #348 (#415)

setup.py

@@ -1,9 +1,11 @@
 from setuptools import setup
 
+desc = """### A light weight Python library for the Spotify Web API"""
+
 setup(
     name='spotipy',
     version='2.5.0',
-    long_description="""### A light weight Python library for the Spotify Web API""",
+    long_description=desc,
     long_description_content_type='text/markdown',
     author="@plamere",
     author_email="paul@echonest.com",
@@ -12,7 +14,6 @@ setup(
         'mock>=2.0.0',
         'requests>=2.3.0',
         'six>=1.10.0',
-        'simplejson==3.13.2',
-  ],
+    ],
     license='LICENSE.txt',
     packages=['spotipy'])