updated readme

Author: fehguy

README.md

@@ -59,7 +59,7 @@ The OpenAPI Specification has undergone 3 revisions since initial creation in 20
 
 Swagger Codegen Version    | Release Date | OpenAPI Spec compatibility | Notes
 -------------------------- | ------------ | -------------------------- | -----
-2.2.0-SNAPSHOT             |              | 1.0, 1.1, 1.2, 2.0   | [master](https://github.com/swagger-api/swagger-codegen)
+2.2.0                      | 2016-07-15   | 1.0, 1.1, 1.2, 2.0   | [tag v2.2.0](https://github.com/swagger-api/swagger-codegen/tree/v2.2.0)
 2.1.6 (**current stable**) | 2016-04-06   | 1.0, 1.1, 1.2, 2.0   | [tag v2.1.6](https://github.com/swagger-api/swagger-codegen/tree/v2.1.6)
 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)