Update README.md

added - [swagger-codegen-maven-plugin](https://github.com/garethjevans/swagger-codegen-maven-plugin)

Author: fehguy

README.md

@@ -84,6 +84,7 @@ These are third party tools generated by the Swagger community:
 - [swagger-springmvc](https://github.com/martypitt/swagger-springmvc) - Integration with Spring MVC.
 - [swagger4spring-web](https://github.com/wkennedy/swagger4spring-web) - Integration with Spring MVC.
 - [swagger-maven-plugin](https://github.com/kongchen/swagger-maven-plugin) - A maven build plugin which helps you generate API document during build phase.
+- [swagger-codegen-maven-plugin](https://github.com/garethjevans/swagger-codegen-maven-plugin) - A maven build plugin which allows the codegen project to be triggered for generating clients, etc. during the build process.
 - [swagger-jaxrs-doclet](https://github.com/ryankennedy/swagger-jaxrs-doclet) - A JavaDoc Doclet that can be used to generate a Swagger resource listing suitable for feeding to swagger-ui.
 - [swaggerj4](https://github.com/SmartBear/swagger4j) - A parsing library to turn swagger specifications into POJOs.
 - [dropwizard-swagger](https://github.com/federecio/dropwizard-swagger) - A dropwizard bundle that wraps Swagger-Core.