Update pygithub from 1.43.8 to 1.44

Author: pyup-bot

dev-requirements.txt

@@ -13,7 +13,7 @@ mypy==0.730  # Type checking
 pip_check_reqs==2.0.3
 pydocstyle==4.0.1  # Lint docstrings
 pyenchant==2.0.0  # Bindings for a spellchecking sytem
-pygithub==1.43.8
+pygithub==1.44
 Pygments==2.4.2
 pylint==2.4.2  # Lint
 pyroma==2.5  # Packaging best practices checker