Fix README links (#895)

Author: duffn

README.md

@@ -22,7 +22,7 @@
 
 ## What is grape-swagger? <a name="what"></a>
 
-The grape-swagger gem provides an autogenerated documentation for your [Grape](https://github.com/ruby-grape/grape) API. The generated documentation is Swagger-compliant, meaning it can easily be discovered in [Swagger UI](https://github.com/wordnik/swagger-ui). You should be able to point [the petstore demo](http://petstore.swagger.io/) to your API.
+The grape-swagger gem provides an autogenerated documentation for your [Grape](https://github.com/ruby-grape/grape) API. The generated documentation is Swagger-compliant, meaning it can easily be discovered in [Swagger UI](https://github.com/swagger-api/swagger-ui). You should be able to point [the petstore demo](http://petstore.swagger.io/) to your API.
 
 ![Demo Screenshot](example/swagger-example.png)
 
@@ -35,7 +35,7 @@ This screenshot is based on the [Hussars](https://github.com/LeFnord/hussars) sa
 * [Grape Swagger Entity](https://github.com/ruby-grape/grape-swagger-entity)
   * [Grape Entity](https://github.com/ruby-grape/grape-entity)
 * [Grape Swagger Representable](https://github.com/ruby-grape/grape-swagger-representable)
-* [Swagger UI](https://github.com/wordnik/swagger-ui)
+* [Swagger UI](https://github.com/swagger-api/swagger-ui)
 
 
 
@@ -95,14 +95,14 @@ module API
 end
 ```
 
-To explore your API, either download [Swagger UI](https://github.com/wordnik/swagger-ui) and set it up yourself or go to the [online swagger demo](http://petstore.swagger.wordnik.com/) and enter your localhost url documentation root in the url field (probably something in the line of http://localhost:3000/swagger_doc).
+To explore your API, either download [Swagger UI](https://github.com/swagger-api/swagger-ui) and set it up yourself or go to the [online swagger demo](http://petstore.swagger.io/) and enter your localhost url documentation root in the url field (probably something in the line of http://localhost:3000/swagger_doc).
 
 
 
 ## Model Parsers <a name="model_parsers"></a>
 
 Since 0.21.0, `Grape::Entity` is not a part of grape-swagger, you need to add `grape-swagger-entity` manually to your Gemfile.
-Also added support for [representable](https://github.com/apotonick/representable) via `grape-swagger-representable`.
+Also added support for [representable](https://github.com/trailblazer/representable) via `grape-swagger-representable`.
 
 ```ruby
 # For Grape::Entity ( https://github.com/ruby-grape/grape-entity )
@@ -115,7 +115,7 @@ If you are not using Rails, make sure to load the parser inside your application
 
 ### Custom Model Parsers
 
-You can create your own model parser, for example for [roar](https://github.com/apotonick/roar).
+You can create your own model parser, for example for [roar](https://github.com/trailblazer/roar).
 
 ```ruby
 module GrapeSwagger