Update docs for v3.0.1.

ONLY FOR TEST

use bugly update sdk

Merge pull request geeeeeeeeek#122 from geeeeeeeeek/release/2.3

Release/2.3

Merge pull request geeeeeeeeek#122 from geeeeeeeeek/release/2.3

Release/2.3

Merge pull request geeeeeeeeek#117 from geeeeeeeeek/release/2.2

Release/2.2

Merge pull request geeeeeeeeek#98 from geeeeeeeeek/release/2.1

Hotfix crash in APK level lower than lollipop.

Merge pull request geeeeeeeeek#96 from geeeeeeeeek/release/2.1

Release/2.1

Merge pull request geeeeeeeeek#52 from geeeeeeeeek/milestone/2.0

Explicitly load preferences on first use.

Merge pull request geeeeeeeeek#49 from geeeeeeeeek/milestone/2.0

Milestone/2.0 Ready to Merge