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>