Update flake8 from 3.7.5 to 3.7.7

pyup-bot · pyup-bot · commit 1a4a02e99302 · 2019-03-04T15:15:12.000+02:00
diff --git a/requirements-dev.txt b/requirements-dev.txt
@@ -6,7 +6,7 @@ aiomysql==0.0.20
 aiopg==0.16.0
 coverage==4.5.2
 docker==3.7.0
-flake8==3.7.5
+flake8==3.7.7
 ipdb==0.11
 motor==2.0.0
 pytest-cov==2.6.1
