Fix flake8 error

Author: staticdev

.flake8

@@ -0,0 +1,2 @@
+[flake8]
+max-line-length = 80

src/github3/github.py

@@ -1980,7 +1980,7 @@ def rate_limit(self):
     def repositories(
         self, type=None, sort=None, direction=None, number=-1, etag=None
     ):
-        """List repositories for the authenticated user, filterable by ``type``.
+        """List repositories for the authenticated user filterable by ``type``.
 
         .. versionchanged:: 0.6