Don't require mock for install (#419)

Fixes #418

CHANGELOG.md

@@ -8,6 +8,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
  - Fixed invalid calls to logging warn method
+ - `mock` no longer needed for install. Only used in `tox`.
 
 ## [2.6.0] - 2020-01-12
 

setup.py

@@ -11,7 +11,6 @@ setup(
     author_email="paul@echonest.com",
     url='http://spotipy.readthedocs.org/',
     install_requires=[
-        'mock>=2.0.0',
         'requests>=2.3.0',
         'six>=1.10.0',
     ],