Merge branch 'master' into dependabot/pip/mock-3.0.3

Author: Boros Gábor

requirements.txt

@@ -1,7 +1,7 @@
 async-generator==1.10; python_version>="3.6"
 codacy-coverage==1.3.11
 mock==3.0.3
-pytest-cov==2.6.1
+pytest-cov==2.7.1
 pytest-tornasync; python_version >= '3.5'
 pytest-trio==0.5.2; python_version>="3.6"
 pytest==4.4.1