doc(readme): add loopback link

Author: klarkc

README.md

@@ -1,7 +1,7 @@
 # vue-loopback
 [![Travis](https://img.shields.io/travis/InCuca/vue-loopback/master.svg)](https://travis-ci.org/InCuca/vue-loopback/branches)
 
-A Vue project template with Loopback framework featuring ES6, Gulp, and Mocha for unit tests
+A Vue project template with [Loopback](http://loopback.io/) framework featuring ES6, Gulp, and Mocha for unit tests
 
 > This template is Vue 2.x **only**.