patch 9.1.0718: hard to know the users personal Vim Runtime Directory

Problem:  hard to guess the Vim Runtime Directory
Solution: Set the $MYVIMDIR environment variable to the users
          personal runtime directory (e.g. ~/.vim on Linux)

closes: #15576

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index 145e083..d7f012c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    718,
+/**/
     717,
 /**/
     716,