Remove 'Rails' as rake task no longer requires it

README.md

@@ -15,7 +15,7 @@ gem 'gemoji'
 
 **Sync images**
 
-Images can be copied to your public directory with `rake emoji` in your Rails app. This is the recommended approach since the images will be available at a consistent location. This works best with cached formatted user content generated by tools like [html-pipeline](https://github.com/jch/html-pipeline).
+Images can be copied to your public directory with `rake emoji` in your app. This is the recommended approach since the images will be available at a consistent location. This works best with cached formatted user content generated by tools like [html-pipeline](https://github.com/jch/html-pipeline).
 
 ``` ruby
 # Rakefile