Update pyflakes from 2.1.0 to 2.1.1

pyup-bot · pyup-bot · commit 20adf8e24f81 · 2019-03-04T15:15:07.000+02:00
diff --git a/demos/blog/requirements-dev.txt b/demos/blog/requirements-dev.txt
@@ -1,4 +1,4 @@
-pyflakes==2.1.0
+pyflakes==2.1.1
 pep8==1.7.1
 pytest==4.2.0
 ipdb==0.11
