Update pytest-cov from 2.10.1 to 2.11.0 (#486)

Author: pyup-bot

requirements-testing.txt

@@ -2,7 +2,7 @@ python-coveralls==2.9.3
 coverage==5.3.1
 flake8==3.8.4
 pytest==6.2.1
-pytest-cov==2.10.1
+pytest-cov==2.11.0
 autopep8==1.5.4
 mypy==0.790
 py-spy==0.3.3