Authored by gaoqiang xu

Merge branch 'master' into no_webp

* master:
  Update README.md
  Update README.md
#YHExplorer
### YHExplorer
两个分支:
- `no_webp`:当外部有webp的framework并发生冲突的时候使用
- `master`:自带webp依赖,可能与外部的framework冲突
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