[feat] Add ionChange event to ion-textarea directive

[diosney]

Ionic version: (check one with "x")
[ ] 1.x
[x] 2.x

I'm submitting a ... (check one with "x")
[ ] bug report
[x] feature request
[ ] support request => Please do not submit support requests here, use one of these channels: https://forum.ionicframework.com/ or http://ionicworldwide.herokuapp.com/

Current behavior:

Event missing from directive. All other input directives seems to have it.

Expected behavior:

ion-textarea to have an ionChange event.

[jgw96]

Hello! Thanks for the feature request. I'm going to move this issue over to our internal list of feature requests for evaluation. We are continually prioritizing all requests that we receive with outstanding issues. We are extremely grateful for your feedback, but it may not always be our next priority. I'll copy the issue back to this repository when we have begun implementation. Thanks!

[jgw96]

This issue was moved to driftyco/ionic-feature-requests#108

[ionitron-bot]

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