Fix spec for cowboy_dispatcher:split_host/1.
Fix spec for cowboy_dispatcher:split_host/1.

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