Remove unnecessary shebang lines (#189)

Since black.py is not marked as executable, the shebang in black.py serves
no purpose. black should be invoked through its entry point any way.

token.py is an internal module without a __name__ == '__main__' block or
other executable code. It contains just list of constants and small
helper functions.

Signed-off-by: Christian Heimes <christian@python.org>

black.py

@@ -1,5 +1,3 @@
-#!/usr/bin/env python3
-
 import asyncio
 import pickle
 from asyncio.base_events import BaseEventLoop

blib2to3/pgen2/token.py

@@ -1,5 +1,3 @@
-#! /usr/bin/env python3
-
 """Token constants (from "token.h")."""
 
 #  Taken from Python (r53757) and modified to include some tokens