Update pytest-cov from 2.11.0 to 2.11.1 (#488)

Co-authored-by: Abhinav Singh <[email protected]>

Author: pyup-bot

requirements-testing.txt

@@ -2,7 +2,7 @@ python-coveralls==2.9.3
 coverage==5.4
 flake8==3.8.4
 pytest==6.2.2
-pytest-cov==2.11.0
+pytest-cov==2.11.1
 autopep8==1.5.4
 mypy==0.790
 py-spy==0.3.3