Update flake8-isort to 2.2 (#53)

* Update flake8-isort from 2.1.3 to 2.2

Author: pyup-bot

requirements.txt

@@ -8,7 +8,7 @@ flake8==3.3.0
 flake8-blind-except==0.1.1
 flake8-debugger==1.4.0
 flake8-docstrings==1.0.3
-flake8-isort==2.1.3
+flake8-isort==2.2
 flake8-quotes==0.9.0
 Flask==0.12
 Flask-Restless==1.0.0b1