Bleeding edge typing breaks mypy.

requirements.txt

@@ -7,5 +7,5 @@ pytest>=2.6.3
 lxml>=3.6.0
 astroid>=1.4.6
 pycodestyle>=2.0.0
-typing>=3.5.2.2
+typing==3.5.2.2
 mypy-extensions>=0.3.0

setup.py.in

@@ -29,7 +29,7 @@ setup(
         'coverage>=3.7.1',
         'pytest>=2.6.3',
         'pycodestyle>=2.0.0',
-        'typing>=3.5.2.2',
+        'typing==3.5.2.2',
         'mypy-extensions>=0.3.0',
     ],
     entry_points={