add mjruby as an example

Author: hone

README.md

@@ -98,6 +98,7 @@ $ docker-compose run bintest
 
 ## Examples
 * `mruby-cli` itself is an app generated by `mruby-cli`, so you can explore this repo on how to build one.
+* [mjruby](https://github.com/jkutner/mjruby) - replacement for jruby-launcher.
 * [mruby-eso-research](https://github.com/hone/mruby-eso-research) - an app for managing crafting research in Elder Scrolls Online. It uses YAML as the data store.
 * [nhk-easy-cli](https://github.com/nhk-ruby/nhk-easy-cli) - a command-line client for reading NHK News Web Easy.