Added X-Log in errorInfo.
Added X-Log in errorInfo.
Merge branch 'feature/xlog' of github.com:hughlv/objc-sdk into feature/xlog
updated README
Merge pull request #13 from why404/develop

updated README
Update README.md
Merge pull request #10 from hughlv/feature/xlog

Feature/xlog
CHANGELOG
Merge pull request #14 from qiniu/develop

Release 3.3.0