added rxui, akavache, splat :party:

Author: ghuntley

docs/who.md

@@ -8,5 +8,8 @@ Various people are actively using GitVersion, and taking advantage of the automa
  * [Orchestra](https://github.com/wildgums/orchestra)
  * [Pomona](http://pomona.io/)
  * [Shouldly](https://github.com/shouldly/shouldly)
+ * [Akavache](https://github.com/akavache/akavache)
+ * [Splat](https://github.com/paulcbetts/splat)
+ * [ReactiveUI](https://github.com/reactiveui/reactiveui)
 
 If you are using GitVersion in your projects, and you are not listed above, please feel free to add a link to your project.