add coverage reports to tests

setup.cfg

@@ -8,3 +8,6 @@ all_files  = 1
 
 [aliases]
 test=pytest
+
+[tool:pytest]
+addopts = --cov=mastodon

setup.py

@@ -5,7 +5,7 @@ setup(name='Mastodon.py',
       description='Python wrapper for the Mastodon API',
       packages=['mastodon'],
       setup_requires=['pytest-runner'],
-      tests_require=['pytest'],
+      tests_require=['pytest', 'pytest-cov'],
       install_requires=['requests', 'python-dateutil', 'six', 'pytz'],
       url='https://github.com/halcy/Mastodon.py',
       author='Lorenz Diener',