patch 9.0.0527: long sign text may overflow buffer

Problem:    Long sign text may overflow buffer.
Solution:   Use a larger buffer.  Prevent for overflow.
diff --git a/src/version.c b/src/version.c
index 76955bb..21ff87d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -700,6 +700,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    527,
+/**/
     526,
 /**/
     525,