patch 8.1.0115: the matchparen plugin may throw an error

Problem:    The matchparen plugin may throw an error.
Solution:   Change the skip argument from zero to "0".
diff --git a/src/version.c b/src/version.c
index 076778a..fa4ec60 100644
--- a/src/version.c
+++ b/src/version.c
@@ -790,6 +790,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    115,
+/**/
     114,
 /**/
     113,