Remove explicit versioning from composer.json and add minor changes.
Remove explicit versioning from composer.json and add minor changes.

SecureCloud-biz/predis,stokes3452/predis,mrkeng/predis,lvbaosong/predis,quangnguyen90/predis,gopalindians/predis,vend/predis,SwelenFrance/predis,WalterShe/predis,CloudSide/predis,moria/predis,dominics/predis,RedisLabs/predis,zhangyancoder/predis,dzung2t/predis,RudyJessop/predis,protomouse/predis,oswaldderiemaecker/predis,nguyenthaihan/predis,gencer/predis,channelgrabber/predis,johnhelmuth/predis,nrk/predis