fix README.mkdn, which still says gingerbread

Change-Id: I1c69a548f69a43f40dd98f378420133da0f09e3c

README.mkdn

@@ -11,7 +11,7 @@ You can do this by using these commands:
     (Go to repo you are patching, make your changes and commit)
     cmgerrit <for(new)/changes(patch set)> <branch/change-id> 
 
-    repo start gingerbread .
+    repo start ics .
     (Make your changes and commit)
     repo upload .
 Note: "." meaning current directory
@@ -31,7 +31,7 @@ familiar with [Git and Repo](http://source.android.com/download/using-repo).
 
 To initialize your local repository using the CyanogenMod trees, use a command like this:
 
-    repo init -u git://github.com/CyanogenMod/android.git -b gingerbread
+    repo init -u git://github.com/CyanogenMod/android.git -b ics
 
 Then to sync up: