Update README.md

Author: icebob

README.md

@@ -9,6 +9,8 @@ A schema-based form generator component for Vue.js
 [![devDependency Status](https://david-dm.org/icebob/vue-form-generator/dev-status.svg)](https://david-dm.org/icebob/vue-form-generator#info=devDependencies)
 [![Downloads](https://img.shields.io/npm/dt/vue-form-generator.svg)](https://www.npmjs.com/package/vue-form-generator)
 
+**Vue v2.x is not supported!**
+
 ## Demo
 [JSFiddle simple example](https://jsfiddle.net/icebob/0mg1v81e/)