chore(dev_reqs): update flake8 to 2.5.4

mboersma · mboersma · commit 3f586d7b84a2 · 2016-02-27T18:47:44.000-07:00
See https://gitlab.com/pycqa/flake8/blob/master/CHANGES.rst
diff --git a/rootfs/dev_requirements.txt b/rootfs/dev_requirements.txt
@@ -2,4 +2,4 @@
 coverage==4.0.3
 
 # Run "make flake8" to check python syntax and style
-flake8==2.5.1
+flake8==2.5.4
