Tweak README and ember-try config

Author: lukemelia

.travis.yml

@@ -19,6 +19,7 @@ env:
   # as well as latest stable release (bonus points to beta/canary)
   - EMBER_TRY_SCENARIO=ember-lts-2.8
   - EMBER_TRY_SCENARIO=ember-lts-2.12
+  - EMBER_TRY_SCENARIO=ember-lts-2.18
   - EMBER_TRY_SCENARIO=ember-release
   - EMBER_TRY_SCENARIO=ember-beta
   - EMBER_TRY_SCENARIO=ember-canary

README.md

@@ -1,6 +1,6 @@
 # ember-buffered-proxy [![Build Status](https://travis-ci.org/yapplabs/ember-buffered-proxy.svg?branch=master)](https://travis-ci.org/yapplabs/ember-buffered-proxy)
 
-An Ember Object Proxy (and mixin) the enables change buffering. Ever need to "hold back" property changes before they propagate? If so this may be the project for you.
+An Ember Object Proxy (and mixin) that enables change buffering. Ever need to "hold back" property changes before they propagate? If so, this may be the addon for you.
 
 ## Usage
 

config/ember-try.js

@@ -27,6 +27,14 @@ module.exports = {
         }
       }
     },
+    {
+      name: 'ember-lts-2.18',
+      npm: {
+        devDependencies: {
+          'ember-source': '~2.18.0'
+        }
+      }
+    },
     {
       name: 'ember-release',
       bower: {