Updated README.md for Core 2 checkout.

Author: nigelb

README.md

@@ -12,15 +12,15 @@ Locate your .platformio directory which it typically in your home directory:
 Clone [SparkFun's Arduino framework](https://github.com/sparkfun/Arduino_Apollo3):
 
     ~/.platformio> cd packages
-    ~/.platformio>/packages> git clone https://github.com/sparkfun/Arduino_Apollo3.git framework-arduinoapollo3
+    ~/.platformio>/packages> git clone --recurse-submodules https://github.com/sparkfun/Arduino_Apollo3.git framework-arduinoapollo3
 
 Create a `package.json` file in the directory you just cloned `.platformio/packages/framework-arduinoapollo3/` with the following contents:
 
 ```json
 {
     "name": "framework-arduinoapollo3",
     "description": "Arduino Wiring-based Framework (Apollo3 Core)",
-    "version": "1.0.22",
+    "version": "2.0.2",
     "url": "https://github.com/sparkfun/Arduino_Apollo3"
 }
 ```