Drop support for EOL Python 2.6

test/completion/pep0484_comments.py

@@ -47,10 +47,6 @@ b
 class Employee:
     pass
 
-# The typing library is not installable for Python 2.6, therefore ignore the
-# following tests.
-# python >= 2.7
-
 from typing import List
 x = []   # type: List[Employee]
 #? Employee()