docs(quickstart): ng add @angular/fire (angular#2517)

Author: pickfire

docs/install-and-setup.md

@@ -13,7 +13,7 @@ The Angular CLI's `new` command will set up the latest Angular build in a new pr
 ### 2. Install AngularFire and Firebase
 
 ```bash
-ng add @angular/fire@next
+ng add @angular/fire
 ```
 
 Now that you have a new project setup, install AngularFire and Firebase from npm.