Update README.md

Get ride of the version property.

Merge pull request zgldh#60 from xcaptain/patch-1

手动指明Storage命名空间

v0.9.2

Fixed big file uploading.

Fixed PersistentFop::status static calling issue

update readme

fixed a shame semicolon.

Update composer.json

Fix PersistentFop to adapt latest qiniu API