Incremented to version: 13700.21.0

Change-Id: Ic33808f6a577303f18309b5c52d3904b483af0f5
diff --git a/chromeos/config/chromeos_version.sh b/chromeos/config/chromeos_version.sh
index 00c1d5d..230d6c8 100755
--- a/chromeos/config/chromeos_version.sh
+++ b/chromeos/config/chromeos_version.sh
@@ -20,7 +20,7 @@
   # Release Branch number.
   # Increment by 1 for every release build on a branch.
   # Reset to 0 when increasing release build number.
-  CHROMEOS_BRANCH=20
+  CHROMEOS_BRANCH=21
 
   # Patch number.
   # Increment by 1 in case a non-scheduled branch release build is necessary.