Fix Acknowledgements (browser) so that hyperlinks open in external browser.

[joewheaton]

The Problem

The update of Acknowledgements associated with completing #3, revealed that any hyperlinks within the acknowledgements do not open in an external browser (what we want) and instead just open within the frame.

Reproduction steps

In the video below we show the current behavior.

![Not loading https://youtu.be/Z_gW8c-Nk3U](http://img.youtube.com/vi/Z_gW8c-Nk3U
/0.jpg)

What we'd like

Is it possible to get the hyperlinks to open the user's default browser?