Fix flake8 issues
Fix flake8 issues

bwalks/pymemcache,adamchainz/pymemcache,thedrow/pymemcache,pinterest/pymemcache,dive-tv/pyelasticache_client,sontek/pymemcache,pinterest/pymemcache,harlowja/pymemcache,mbrukman/pymemcache,ewdurbin/pymemcache,sontek/pymemcache