Add deprecation notice

Author: tlancina

README.md

@@ -1,8 +1,11 @@
-# Ionic Gulp tasks
+# [Deprecated]
+Now that Ionic 2 is out of beta, please see the [ionic-app-scripts](https://github.com/driftyco/ionic-app-scripts) repository for Ionic 2 build configuration scripts.
+
+### Ionic Gulp tasks
 
 A curated collection of [Gulp](http://gulpjs.com/) tasks for building Ionic apps. Using these tasks allows you to stay up to date if the default Ionic 2 build changes while it is in Beta.
 
-## Tasks
+#### Tasks
 
 Tasks are configured to work by default with the Ionic starters generated by the [Ionic CLI](github.com/driftyco/ionic-cli).