Merge remote-tracking branch 'origin/master' into 3.1

Merge remote-tracking branch 'origin/master' into 3.1

Merge remote-tracking branch 'origin/master' into 3.1

Merge remote-tracking branch 'origin/master' into 3.1

Update README.md

Merge pull request antvis#52 from antvis/publish-3-0-3

publish v3.0.3

Merge pull request antvis#42 from antvis/publish-3-0-2

publish 3.0.2

chore(dev): ignore useless files to speed up npm publishing

fixed bug of smooth