Btrfs progs v4.0

Signed-off-by: David Sterba <dsterba@suse.cz>
diff --git a/version.sh b/version.sh
index b2eaa8b..4f282e2 100755
--- a/version.sh
+++ b/version.sh
@@ -6,7 +6,7 @@
 # Copyright 2008, Oracle
 # Released under the GNU GPLv2
  
-v="v3.19.1"
+v="v4.0"
 
 opt=$1