CLN: Make _version.py flake8-able

Author: gfyoung

pandas/_version.py

@@ -1,4 +1,3 @@
-
 # This file helps to compute a version number in source trees obtained from
 # git-archive tarball (such as those provided by githubs download-from-tag
 # feature). Distribution tarballs (built by setup.py sdist) and build
@@ -8,8 +7,6 @@
 # This file is released into the public domain. Generated by
 # versioneer-0.15 (https://github.com/warner/python-versioneer)
 
-# flake8: noqa
-
 import errno
 import os
 import re