run action while componentDidMount do not trigger props update

```
@connect({
a: 'a',
}, {
doSomething: () => {
return {a: 'b'};
}
})
export class Example extends Component {
componentDidMount() {
this.props.doSomething();
}

componentWillReceiveProps(nextProps) {
console.log("nextProps", nextProps);
}
}
```

this example shows what i had done.

**i triggered an action in componentDidMount, but componentWillReceiveProps can not receive any update.**

i look into the code and found out the problem is the wrapper outside my component register a listener while componentDidMount, but its child componet, **my component, mounted before the wrapper.**

**so when my component run componentDidMount, the wrapper haven't run the subscription method yet. therefore it can't reveive any update.**

so why not use the **componentWillMount** to replace the **componentDidMount**. **componentWillMount** will be triggered in a right order from parent to child. so subscription function can capture and update any changes from the child component.