Update CHANGELOG.
Update CHANGELOG.

Remove recently added lines as they are not entirely true, the client
currently does not apply any key prefixing for any command not created
by Redis profiles even though it is possible now, contrary to v0.8.

[ci skip]

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