Update composer.json
Update composer.json

Add `conflict` part as `doctrine/common` <2.4 has cache in it.
jeskew/cache,mpdude/cache,anonpain/cache,doktorsitesi/cache,guilhermeblanco/cache,piwik/cache,doctrine/cache,Rican7/cache,Tobion/cache,robocoder/cache,Ocramius/cache,doktorsitesi/cache,robocoder/cache,jenniferyien/cache