Prepare for 0.2.3 release

Author: gaearon

template/README.md

@@ -392,8 +392,7 @@ We will consider integrating more tightly with Flow in the future so that you do
 
 ## Adding Custom Environment Variables
 
-**Note: this feature will be available with `react-scripts@0.3.0` and higher.**  
-**It is not released yet, but it will be a part of a future release.**
+>Note: this feature is available with `react-scripts@0.2.3` and higher.
 
 Your project can consume variables declared in your environment as if they were declared locally in your JS files. By
 default you will have `NODE_ENV` defined for you, and any other environment variables starting with
@@ -467,8 +466,7 @@ Check out [this tutorial](https://www.fullstackreact.com/articles/using-create-r
 
 ## Proxying API Requests in Development
 
-**Note: this feature will be available with `react-scripts@0.3.0` and higher.**  
-**It is not released yet, but it will be a part of a future release.**
+>Note: this feature is available with `react-scripts@0.2.3` and higher.
 
 People often serve the front-end React app from the same host and port as their backend implementation.  
 For example, a production setup might look like this after the app is deployed: