patch 9.1.0536: filetype: zone files are not recognized

Problem:  filetype: zone files are not recognized
          (rpdprd)
Solution: Detect '*.zone' files as bindzone filetype

fixes: #14222

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index ffbc13e..359605b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    536,
+/**/
     535,
 /**/
     534,