1.0.4 One-Click Install

Added documentation for one-click install feature

## One-Click Install

To install Wafelijzer on a free [Heroku](https://www.heroku.com/) server, click the button below. You'll be prompted to create a Heroku account, and then you'll be up and running in seconds.

[![Deploy](https://www.herokucdn.com/deploy/button.png)](https://heroku.com/deploy?template=https://github.com/belgianman/wafelijzer)