Fixed .gitmodules to point to new WiringPi org

Author: Gadgetoid

.gitmodules

@@ -1,3 +1,3 @@
 [submodule "WiringPi"]
 	path = WiringPi
-	url = https://github.com/Gadgetoid/WiringPi.git
+	url = https://github.com/WiringPi/WiringPi.git

README

@@ -10,8 +10,7 @@ Prerequisites:
 Get/setup repo:
     git clone https://github.com/Gadgetoid/WiringPi-Python.git
     cd WiringPi-Python
-    git submodule init
-    git submodule update
+    git submodule update --init
 
 Build & install with:
     sudo python setup.py install