patch 9.1.0839: filetype: leo files are not recognized

Problem:  filetype: leo files are not recognized
Solution: detect '*.leo' files as leo filetype, include
          a filetype plugin (Riley Bruins)

References:
https://github.com/ProvableHQ/leo

closes: #15988

Signed-off-by: Riley Bruins <ribru17@hotmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index d213e66..f13567f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    839,
+/**/
     838,
 /**/
     837,