dtc: Bump version to 1.4.1

Bump version number in preparation for a release.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
diff --git a/Makefile b/Makefile
index c35f2f1..c1d0757 100644
--- a/Makefile
+++ b/Makefile
@@ -10,7 +10,7 @@
 #
 VERSION = 1
 PATCHLEVEL = 4
-SUBLEVEL = 0
+SUBLEVEL = 1
 EXTRAVERSION =
 LOCAL_VERSION =
 CONFIG_LOCALVERSION =