Add notice about v1 breaking change

README.md

@@ -1,13 +1,11 @@
-# WARNING: NO LONGER MAINTAINED
-
-You probably want to use [webpack-contrib/polymer-webpack-loader](https://github.com/webpack-contrib/polymer-webpack-loader) instead.
-
-
-
 # polymer-loader
 
 Loads polymer-elements as first-class bundles. Allows you to separate components into a .js file, a .html file containing the `<polymer-element>` and a CSS file. Polymer-loader can be configured to use your choice of HTML/CSS preprocessor (Jade, EBS, Stylus, LESS, SASS, etc.).
 
+# Breaking Changes: v1.0.0
+
+v1.0.0 adds support for polymer v3 and drops support for Polymer < 3. Lock your version to < 1.0.0 if you still support Polymer < 3.
+
 ## Installation
 
 ```