Fix build version.

Release 4.0.0.

Update docs for v3.0.1.

ONLY FOR TEST

use bugly update sdk

Merge pull request zhongyi-tong#122 from geeeeeeeeek/release/2.3

Release/2.3

Merge pull request zhongyi-tong#122 from geeeeeeeeek/release/2.3

Release/2.3

Merge pull request zhongyi-tong#117 from geeeeeeeeek/release/2.2

Release/2.2

Merge pull request zhongyi-tong#98 from geeeeeeeeek/release/2.1

Hotfix crash in APK level lower than lollipop.

Merge pull request zhongyi-tong#96 from geeeeeeeeek/release/2.1

Release/2.1