Update flake8 from 3.7.6 to 3.7.7 (#585)

pyup-bot · sliverc · commit 74af88aa56b7 · 2019-03-03T20:31:37.000+01:00
diff --git a/requirements-development.txt b/requirements-development.txt
@@ -4,7 +4,7 @@ django-filter==2.1.0
 django-polymorphic==2.0.3
 factory-boy==2.11.1
 Faker==1.0.2
-flake8==3.7.6
+flake8==3.7.7
 flake8-isort==2.6.0
 isort==4.3.9
 mock==2.0.0
