DatePicker的minDate和maxDate在初始化之后就不能改变了

[changhui3067]

https://github.com/NewDadaFE/react-impression/blob/master/packages/react-impression/src/components/DatePicker/DatePicker.js

在componentWillReceiveProps中只做了对props.value改变的处理。理论上所有从props的传入都应该引起控件内部的相应变化