updated readme with warning about 2.0 vs 1.2

Author: Trevor Livingston

README.md

@@ -2,6 +2,8 @@
 
 # swaggerize-express
 
+**WARNING:** This module now uses Swagger 2.0. For the Swagger 1.2 compatible version, see the 2.0.0 branch versions.
+
 - **Stability:** `stable`
 - **Changelog:** [https://github.com/krakenjs/swaggerize-express/blob/master/CHANGELOG.md](https://github.com/krakenjs/swaggerize-express/blob/master/CHANGELOG.md)
 
@@ -178,4 +180,4 @@ Example:
 swaggerize --api config/api.json --models resources/models --handlers resources/handlers --tests tests/
 ```
 
-`--api` is required, but only one of `--models` or `--handlers` or `--tests` is required.
+`--api` is required, but only one of `--models` or `--handlers` or `--tests` is required.