Rephrase some parts of the README.
Rephrase some parts of the README.

[ci skip]

quangnguyen90/predis,SecureCloud-biz/predis,nguyenthaihan/predis,CloudSide/predis,zhangyancoder/predis,gencer/predis,dzung2t/predis,moria/predis,mrkeng/predis,protomouse/predis,lvbaosong/predis,RudyJessop/predis,WalterShe/predis,gopalindians/predis