Allow resize to occur if style or className have changed

[mobeigi]

Fixes: #446

The pickKeys line returns early even if the style and className have changed so the check below it is unreachable code.

So solve this we inverse the check and do a this.updateEChartsOption() if the pickKeys props have changed.
Then we also do the check for style and className updates before resizing.

[coveralls]

Coverage remained the same at 96.97% when pulling 843bf39 on mobeigi:fix-style-classname-bug into 7d20c9a on hustcc:master.

[mobeigi]

Hi @hustcc , thanks for reviewing the outstanding PRs. 👍

I am hoping we can also merge in this PR fix and release new npm version 3.0.2

[hustcc]

released https://github.com/hustcc/echarts-for-react/releases/tag/v3.0.2