Describe using of status code symbols in readme. Add new entry to changelog.

Author: dabrorius

CHANGELOG.md

@@ -5,6 +5,7 @@
 
 * [#936](https://github.com/intridea/grape/pull/936): Fixed default params processing for optional groups - [@dm1try](https://github.com/dm1try).
 * [#942](https://github.com/intridea/grape/pull/942): Fixed forced presence for optional params when based on a reused entity that was also required in another context - [@croeck](https://github.com/croeck).
+* [#950](https://github.com/intridea/grape/pull/950): Status method can now accept one of Rack::Utils status code symbols (:ok, :found, :bad_request, etc.) - [@dabrorius](https://github.com/dabrorius)
 
 * Your contribution here.
 

README.md

@@ -352,6 +352,14 @@ post do
 end
 ```
 
+You can also use one of status codes symbols that are provided by [Rack utils](http://www.rubydoc.info/github/rack/rack/Rack/Utils#HTTP_STATUS_CODES-constant)
+
+```ruby
+post do
+  status :no_content
+end
+```
+
 ### Accept-Version Header
 
 ```ruby