added note about version between react-test-render using with react & react-dom

content/docs/reference-test-renderer.md

@@ -19,6 +19,8 @@ This package provides a React renderer that can be used to render React componen
 
 Essentially, this package makes it easy to grab a snapshot of the platform view hierarchy (similar to a DOM tree) rendered by a React DOM or React Native component without using a browser or [jsdom](https://github.com/tmpvar/jsdom).
 
+**Note:** make sure `react-test-renderer` version is the same with `react`, `react-dom` version.
+
 Example:
 
 ```javascript