Add flake8 check for pep8 naming
Add flake8 check for pep8 naming

Add flake8 check for pep8 naming using pep8-naming.

xsteadfastx/beets,jackwilsdon/beets,MyTunesFreeMusic/privacy-policy,jackwilsdon/beets,madmouser1/beets,madmouser1/beets,Kraymer/beets,Freso/beets,beetbox/beets,Freso/beets,xsteadfastx/beets,sampsyo/beets,mosesfistos1/beetbox,mosesfistos1/beetbox,Kraymer/beets,SusannaMaria/beets,beetbox/beets,sampsyo/beets,ibmibmibm/beets,jcoady9/beets,artemutin/beets,Freso/beets,shamangeorge/beets,mosesfistos1/beetbox,diego-plan9/beets,lengtche/beets,lengtche/beets,madmouser1/beets,diego-plan9/beets,xsteadfastx/beets,MyTunesFreeMusic/privacy-policy,sampsyo/beets,Kraymer/beets,ibmibmibm/beets,artemutin/beets,lengtche/beets,beetbox/beets,xsteadfastx/beets,mosesfistos1/beetbox,pkess/beets,ibmibmibm/beets,jcoady9/beets,pkess/beets,Freso/beets,sampsyo/beets,jcoady9/beets,Kraymer/beets,pkess/beets,jackwilsdon/beets,artemutin/beets,MyTunesFreeMusic/privacy-policy,SusannaMaria/beets,diego-plan9/beets,MyTunesFreeMusic/privacy-policy,madmouser1/beets,SusannaMaria/beets,shamangeorge/beets,beetbox/beets,lengtche/beets,jcoady9/beets,pkess/beets,jackwilsdon/beets,diego-plan9/beets,SusannaMaria/beets,shamangeorge/beets,ibmibmibm/beets,artemutin/beets,shamangeorge/beets