Update docker compose README
Update docker compose README

secondsun/aerogear-unifiedpush-server,secondsun/aerogear-unifiedpush-server,aerogear/aerogear-unifiedpush-server,secondsun/aerogear-unifiedpush-server,aerogear/aerogear-unifiedpush-server,aerogear/aerogear-unifiedpush-server