message: docs(README): fix waffle.io badge
diff: @@ -12,7 +12,7 @@ was written correctly and much more.
  [![Build Status](https://travis-ci.org/resin-io/etcher.svg?branch=master)](https://travis-ci.org/resin-io/etcher)
  [![Build status](https://ci.appveyor.com/api/projects/status/e745k1gt39nik0t7/branch/master?svg=true)](https://ci.appveyor.com/project/resin-io/etcher/branch/master)
  [![Gitter](https://badges.gitter.im/resin-io/etcher.svg)](https://gitter.im/resin-io/etcher?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
  -[![Stories in Ready](https://badge.waffle.io/resin-io/etcher.svg?label=in progress&title=In Progress)](https://waffle.io/resin-io/etcher)
  +[![Stories in Ready](https://badge.waffle.io/resin-io/etcher.svg?label=in%20progress&title=In%20Progress)](https://waffle.io/resin-io/etcher)
  ***
  