Merge pull request #3455 from freqtrade/dependabot/pip/develop/pytest-mock-3.1.1

Bump pytest-mock from 3.1.0 to 3.1.1

requirements-dev.txt

@@ -11,7 +11,7 @@ mypy==0.770
 pytest==5.4.2
 pytest-asyncio==0.12.0
 pytest-cov==2.9.0
-pytest-mock==3.1.0
+pytest-mock==3.1.1
 pytest-random-order==1.0.4
 
 # Convert jupyter notebooks to markdown documents