Update pygithub from 1.44.1 to 1.45

Author: pyup-bot

dev-requirements.txt

@@ -20,7 +20,7 @@ mypy==0.761  # Type checking
 pip_check_reqs==2.0.3
 pydocstyle==5.0.1  # Lint docstrings
 pyenchant==2.0.0  # Bindings for a spellchecking sytem
-pygithub==1.44.1
+pygithub==1.45
 pylint==2.4.4  # Lint
 pyroma==2.6  # Packaging best practices checker
 pytest-cov==2.8.1  # Measure code coverage