pylint: Check for inclusion directly in dictionary

don't use .keys() b/c pylint doesn't like this on Python 3 and because
it is equivalent.

Author: atodorov

kiwi_lint/views.py

@@ -71,7 +71,7 @@ def flatten(urlpatterns, prefix="^", result=None):
         return flatten(root_urlpatterns)
 
     def visit_module(self, node):
-        if node.name in self.views_by_module.keys() and not node.name.endswith(
+        if node.name in self.views_by_module and not node.name.endswith(
             ".admin"
         ):
             self.view_module = node.name