Update README.md

install cmds

Author: bradmartin

README.md

@@ -21,8 +21,12 @@ Android | iOS
 ## Installation
 From your command prompt/termial go to your app's root folder and execute:
 
+#### NativeScript 3.0+
 `tns plugin add nativescript-drawingpad`
 
+#### NativeScript < 3
+`tns plugin add nativescript-drawingpad@1.1.2`
+
 ## Video Tutorial
 [Egghead lesson - https://egghead.io/lessons/javascript-capture-drawings-and-signatures-in-a-nativescript-app](https://egghead.io/lessons/javascript-capture-drawings-and-signatures-in-a-nativescript-app)