UUID data_type format support

Updating changelog

Author: Miguel Martinez

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 #### Features
 
+* [#531](https://github.com/ruby-grape/grape-swagger/pull/531): UUID data_type format support - [@migmartri](https://github.com/migmartri).
 * [#534](https://github.com/ruby-grape/grape-swagger/pull/534): Allows to overwrite defaults status codes - [@LeFnord](https://github.com/LeFnord).
 * Your contribution here.
 

lib/grape-swagger/doc_methods/data_type.rb

@@ -83,7 +83,8 @@ def mapping(value)
         'dateTime' => %w(string date-time),
         'binary' => %w(string binary),
         'password' => %w(string password),
-        'email' => %w(string email)
+        'email' => %w(string email),
+        'uuid' => %w(string uuid)
       }.freeze
     end
   end