Make coveralls dependent on the TOXENV variable being "cover"
Make coveralls dependent on the TOXENV variable being "cover"

jsha/letsencrypt,BKreisel/letsencrypt,letsencrypt/letsencrypt,Bachmann1234/letsencrypt,lbeltrame/letsencrypt,hsduk/lets-encrypt-preview,VladimirTyrin/letsencrypt,kuba/letsencrypt,ghyde/letsencrypt,hlieberman/letsencrypt,BillKeenan/lets-encrypt-preview,Jadaw1n/letsencrypt,DavidGarciaCat/letsencrypt,BillKeenan/lets-encrypt-preview,digideskio/lets-encrypt-preview,beermix/letsencrypt,vcavallo/letsencrypt,riseofthetigers/letsencrypt,g1franc/lets-encrypt-preview,armersong/letsencrypt,TheBoegl/letsencrypt,PeterMosmans/letsencrypt,sjerdo/letsencrypt,ahojjati/letsencrypt,tyagi-prashant/letsencrypt,TheBoegl/letsencrypt,lbeltrame/letsencrypt,diracdeltas/lets-encrypt-preview,lmcro/letsencrypt,rugk/letsencrypt,ghyde/letsencrypt,lmcro/letsencrypt,letsencrypt/letsencrypt,rutsky/letsencrypt,stweil/letsencrypt,Jonadabe/letsencrypt,Bachmann1234/letsencrypt,jmaurice/letsencrypt,vcavallo/letsencrypt,rugk/letsencrypt,xgin/letsencrypt,sapics/letsencrypt,martindale/letsencrypt,modulexcite/letsencrypt,jtl999/certbot,PeterMosmans/letsencrypt,bsmr-misc-forks/letsencrypt,tyagi-prashant/letsencrypt,DavidGarciaCat/letsencrypt,jmhodges/letsencrypt,tdfischer/lets-encrypt-preview,luorenjin/letsencrypt,kuba/letsencrypt,Jonadabe/letsencrypt,mitnk/letsencrypt,brentdax/letsencrypt,rlustin/letsencrypt,stewnorriss/letsencrypt,ahojjati/letsencrypt,Sveder/letsencrypt,modulexcite/letsencrypt,ruo91/letsencrypt,solidgoldbomb/letsencrypt,thanatos/lets-encrypt-preview,martindale/letsencrypt,deserted/letsencrypt,mrb/letsencrypt,fmarier/letsencrypt,diracdeltas/lets-encrypt-preview,BKreisel/letsencrypt,rutsky/letsencrypt,jmhodges/letsencrypt,stewnorriss/letsencrypt,solidgoldbomb/letsencrypt,jsha/letsencrypt,hsduk/lets-encrypt-preview,kevinlondon/letsencrypt,dietsche/letsencrypt,hlieberman/letsencrypt,Jadaw1n/letsencrypt,piru/letsencrypt,goofwear/letsencrypt,ruo91/letsencrypt,digideskio/lets-encrypt-preview,skynet/letsencrypt,g1franc/lets-encrypt-preview,wteiken/letsencrypt,dietsche/letsencrypt,kevinlondon/letsencrypt,bsmr-misc-forks/letsencrypt,stweil/letsencrypt,skynet/letsencrypt,bestwpw/letsencrypt,Hasimir/letsencrypt,twstrike/le_for_patching,tdfischer/lets-encrypt-preview,VladimirTyrin/letsencrypt,thanatos/lets-encrypt-preview,piru/letsencrypt,jmaurice/letsencrypt,deserted/letsencrypt,twstrike/le_for_patching,Sveder/letsencrypt,goofwear/letsencrypt,luorenjin/letsencrypt,jtl999/certbot,armersong/letsencrypt,xgin/letsencrypt,wteiken/letsencrypt,Hasimir/letsencrypt,brentdax/letsencrypt,beermix/letsencrypt,riseofthetigers/letsencrypt,bestwpw/letsencrypt,fmarier/letsencrypt,sjerdo/letsencrypt,rlustin/letsencrypt,sapics/letsencrypt,mrb/letsencrypt,mitnk/letsencrypt