Improve the return value for cowboy_http_rest:upgrade/4
Improve the return value for cowboy_http_rest:upgrade/4

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