Allow passing onBlur, onKeyUp, onKeyDown while still running emitChange

[tony]

react-contenteditable/src/react-contenteditable.tsx

Lines 48 to 52 in a7f6c78

	onInput: this.emitChange,
	onBlur: this.props.onBlur || this.emitChange,
	onKeyUp: this.props.onKeyUp || this.emitChange,
	onKeyDown: this.props.onKeyDown || this.emitChange,
	contentEditable: !this.props.disabled,

emitChange triggers onChange, which sends up a typed event with event.target.value attached

In my case, onBlur, onKeyUp, onKeyDown aren't used to change state, but to toggle CSS classes.

[tony]

Proposal would be, if a function is passed to this.props.on{Blur,KeyUp,KeyDown}, pass (event: React.SyntheticEvent<any>, emitChange(originalEvt: React.SyntheticEvent<any>) => void) to the prop, this way, they could still run emitChange(event) if they want.

I don't think this would be possible due to the underlying typings of on{Blur,KeyUp,KeyDown}