Add CHANGELOG.md file
Add CHANGELOG.md file

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