react 16 supported

[RaoHai]

• react@16.0.0 supported
• use createPortal instead of unstable_renderSubtreeIntoContainer
• close Update immutable or make it a peer dep #17
• close support React 16 #19
• version to v1.1.0

[RaoHai]

@MrPeak be free to take a review...

[coveralls]

Coverage decreased (-26.5%) to 36.685% when pulling f2c7247 on react16 into 677d893 on master.

[coveralls]

Coverage decreased (-26.5%) to 36.685% when pulling c33ad71 on react16 into 677d893 on master.

[coveralls]

Coverage decreased (-26.5%) to 36.685% when pulling c33ad71 on react16 into 677d893 on master.

[benjycui]

这样改了之后，就不兼容 React@15 了吧。。

[benjycui]

See: https://github.com/react-component/trigger/blob/master/src/index.js

[yesmeck]

我来换成 rc-trigger 好了。

[coveralls]

Coverage decreased (-26.5%) to 36.685% when pulling e6051f3 on react16 into 677d893 on master.

[yesmeck]

我来改下吧。

[coveralls]

Coverage decreased (-7.3%) to 55.877% when pulling b4eb91c on react16 into 677d893 on master.

[coveralls]

Coverage decreased (-7.3%) to 55.877% when pulling 98fd536 on react16 into 677d893 on master.