Merge pull request #2169 from xhh/ruby-nested-model-ref

[Ruby] Fix class name reference of nested model

modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/RubyClientCodegen.java

@@ -316,7 +316,7 @@ public class RubyClientCodegen extends DefaultCodegen implements CodegenConfig {
         if (type == null) {
             return null;
         }
-        return type;
+        return toModelName(type);
     }
 
     @Override