[requires.io] dependency update

Author: requires

tox.ini

@@ -120,7 +120,7 @@ skip_install = True
 
 deps =
     flake8-bugbear==20.1.4
-    flake8==3.8.2
+    flake8==3.8.3
     mccabe==0.6.1
     pep8-naming==0.10.0
     pycodestyle==2.6.0