Clean whitespaces.

Author: asherf

tox.ini

@@ -11,18 +11,18 @@ deps =
     -rrequirements.txt
 skip_missing_interpreters=true
 
-changedir = 
+changedir =
     end2end: {toxinidir}/django_prometheus/tests/end2end
 setenv =
     end2end: PYTHONPATH = {toxinidir}
-    end2end: DJANGO_SETTINGS_MODULE=testapp.settings 
+    end2end: DJANGO_SETTINGS_MODULE=testapp.settings
 commands =
     end2end: coverage run --source=django_prometheus -m pytest testapp/
     unittests: coverage run --source=django_prometheus setup.py test
     unittests: python setup.py sdist bdist_wheel
 
 [testenv:py37-lint]
-deps = 
+deps =
     black
     flake8
     isort