Bump yang tools version to 2.4

Change-Id: I7fada36e6ecd93d761c41ba70f057ce3a62b842b
diff --git a/tools/dev/bin/patch-yang-libs b/tools/dev/bin/patch-yang-libs
index 9e590d7..3e269fe 100755
--- a/tools/dev/bin/patch-yang-libs
+++ b/tools/dev/bin/patch-yang-libs
@@ -3,8 +3,8 @@
 # Patches lib/BUCK file to use locally built YANG tools.
 # -----------------------------------------------------------------------------
 
-BVER=2.3.1
-SVER=2.4-SNAPSHOT
+BVER=2.4
+SVER=2.5-SNAPSHOT
 
 YANG_TOOLS_ROOT=${YANG_TOOLS_ROOT:-~/onos-yang-tools}