Memory issue when deleting

[Vezul]

When using the destroy method, like explained in the documentation:

autosize.destroy(document.querySelectorAll('textarea'));

The clean up code at https://github.com/jackmoore/autosize/blob/master/src/autosize.js#L126-L135 does not cleanup the event listener for autosize:update. Which causes leaking of listeners.

[Vezul]

Simply the following line should be added:

ta.removeEventListener('autosize:update', update);