Fix a grammar error reported by DeadZen on IRC.
Fix a grammar error reported by DeadZen on IRC.

kivra/cowboy,heroku/cowboyku,pap/cowboy,nviennot/cowboy,dangjun625/cowboy,odo/cowboy,bobos/ecweb,cad627/cowboy,callsign-core/cowboy_hybi00,MSch/cowboy,bsmr-erlang/cowboy,essen/cowboy,cad627/cowboy,acrispin/cowboy,hairyhum/cowboy,yangchengjian/cowboy,CrankWheel/cowboy,yangchengjian/cowboy,sile/cowboy,ferd/cowboyku,276361270/cowboy,unisontech/cowboy,lpgauth/cowboy,chef/cowboy,layerhq/cowboy,callsign-core/cowboy_hybi00,binarin/cowboy,linearregression/cowboyku,manastech/cowboy,turtleDeng/cowboy,essen/cowboy,K2InformaticsGmbH/cowboy,ninenines/cowboy,manastech/cowboy,heroku/cowboy,lpgauth/cowboy,paulperegud/cowboy,LineMetrics/cowboy,LineMetrics/cowboy,noname007/cowboy,layerhq/cowboy,imdeps/cowboy,heroku/cowboy,grahamrhay/cowboy,venkateshreddy/cowboy,rbalint/pkg-erlang-cowboy,binarin/cowboy,omusico/cowboy,rabbitmq/cowboy,LineMetrics/cowboy,unisontech/cowboy,piboye/cowboy,piboye/cowboy,Reimerei/cowboy