chore(client+controller): update flake8 to 2.4.1

See https://gitlab.com/pycqa/flake8/blob/master/CHANGES.rst

Author: mboersma

client/Makefile

@@ -31,7 +31,7 @@ setup-venv:
 	@if [ ! -d venv ]; then virtualenv venv; fi
 
 test-style: setup-venv
-	venv/bin/pip install --disable-pip-version-check -q flake8==2.4.0
+	venv/bin/pip install --disable-pip-version-check -q flake8==2.4.1
 	venv/bin/flake8
 
 test-unit:

controller/dev_requirements.txt

@@ -2,7 +2,7 @@
 coverage>=3.7.1
 
 # Run "make flake8" to check python syntax and style
-flake8==2.4.0
+flake8==2.4.1
 
 # Used for mocking endpoints
 mock==1.0.1