Update readme with instrunctions on how to use new style

Author: rondale-sc

.travis.yml

@@ -10,6 +10,7 @@ cache:
 
 env:
   # we recommend testing LTS's and latest stable release (bonus points to beta/canary)
+  - EMBER_TRY_SCENARIO=ember-lts-2.12
   - EMBER_TRY_SCENARIO=ember-release
   - EMBER_TRY_SCENARIO=ember-beta
   - EMBER_TRY_SCENARIO=ember-canary

README.md

@@ -17,6 +17,8 @@ Install by running
 ember install ember-cli-head
 ```
 
+And add `{{head-layout}}` to the top of your application template.
+
 #### Version
 Take into account that version >= 0.3 of this addon require Ember 2.10+ and fastboot >=1.0.rc1
 Please use 0.2.X if you don't fulfull both requirements.

config/ember-try.js

@@ -1,6 +1,14 @@
 /* eslint-env node */
 module.exports = {
   scenarios: [
+    {
+      name: 'ember-lts-2.12',
+      npm: {
+        devDependencies: {
+          'ember-source': '~2.12.0'
+        }
+      }
+    },
     {
       name: 'ember-release',
       bower: {