patch 8.1.1614: 'numberwidth' can only go up to 10

Problem:    'numberwidth' can only go up to 10.
Solution:   Allow up to 20. (Charlie Stanton, closes #4584)
diff --git a/src/version.c b/src/version.c
index 2ba2bca..8a9f347 100644
--- a/src/version.c
+++ b/src/version.c
@@ -778,6 +778,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1614,
+/**/
     1613,
 /**/
     1612,