Add mock to requirements (needed for py2)

gyermolenko · gyermolenko · commit a1f33f1b2171 · 2019-01-16T12:03:02.000+02:00
diff --git a/requirements-dev.txt b/requirements-dev.txt
@@ -3,3 +3,4 @@ pytest~=4.1
 pytest-cov~=2.6
 flake8~=3.6
 codecov~=2.0
+mock~=2.0
