Merge pull request #2687 from bdarnell/req-bump

Bump version of twisted to pick up security fix

Author: bdarnell

maint/requirements.txt

@@ -56,7 +56,7 @@ toml==0.10.0
 tox==3.9.0
 tqdm==4.31.1
 twine==1.13.0
-Twisted==19.2.0
+Twisted==19.2.1
 typed-ast==1.3.5
 urllib3==1.24.3
 virtualenv==16.5.0