Update README.md

Author: webron

README.md

@@ -18,7 +18,7 @@ The Swagger Specification has undergone 3 revisions since initial creation in 20
 
 Swagger Codegen Version | Release Date | Swagger Spec compatability | Notes
 ----------------------- | ------------ | -------------------------- | -----
-2.1.2-M1                | 2015-02-23   | 1.0, 1.1, 1.2, 2.0   | [tag v2.1.0-M1](https://github.com/swagger-api/swagger-codegen)
+2.1.2-M1 (master)       | 2015-02-23   | 1.0, 1.1, 1.2, 2.0   | [tag v2.1.0-M1](https://github.com/swagger-api/swagger-codegen)
 2.0.17                  | 2014-08-22   | 1.1, 1.2      | [tag v2.0.17](https://github.com/swagger-api/swagger-codegen/tree/v2.0.17)
 1.0.4                   | 2012-04-12   | 1.0, 1.1      | [tag v1.0.4](https://github.com/swagger-api/swagger-codegen/tree/swagger-codegen_2.9.1-1.1)