This is cm14, adapt repo init command

Change-Id: I8b540339ecbe942230bfbd6d0165ff5edea453f2
diff --git a/README.mkdn b/README.mkdn
index f36e5bc..c9892aa 100644
--- a/README.mkdn
+++ b/README.mkdn
@@ -31,7 +31,7 @@
 
 To initialize your local repository using the CyanogenMod trees, use a command like this:
 
-    repo init -u git://github.com/CyanogenMod/android.git -b staging/cm-14.0
+    repo init -u git://github.com/CyanogenMod/android.git -b cm-14.0
 
 Then to sync up: