Editor freezes when [data] is string

[pomek]

Not related to reported issue but if you pass as [data] any string, after changing editor's content, you will freeze the app. I guess, we should remove this part of the code:

ckeditor5-react/src/ckeditor.jsx

Lines 25 to 27 in a31de76

	if ( 'data' in this.props && this.props.data !== this.editor.getData() ) {
	this.editor.setData( this.props.data );
	}

We shouldn't care about updating editor's content if the state has changed. A user can do it manually just by calling the callback as the second parameter in setState function.

Originally posted by @pomek in #75 (comment)

[pomek]

Closed by mistake. Sorry. I specified the wrong issue in the commit message.