patch 8.1.1116: cannot enforce a Vim script style

Problem:    Cannot enforce a Vim script style.
Solution:   Add the :scriptversion command. (closes #3857)
diff --git a/runtime/doc/repeat.txt b/runtime/doc/repeat.txt
index eed064a..dc441d3 100644
--- a/runtime/doc/repeat.txt
+++ b/runtime/doc/repeat.txt
@@ -1,4 +1,4 @@
-*repeat.txt*    For Vim version 8.1.  Last change: 2018 Dec 18
+*repeat.txt*    For Vim version 8.1.  Last change: 2019 Apr 04
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -325,6 +325,17 @@
 <
 			{not in Vi}
 
+:scriptv[ersion] {version}		*:scriptv* *:scriptversion*
+								*E999* *E984*
+			Specify the version of Vim for the lines that follow.
+			Does not apply to sourced scripts.
+
+			If {version} is higher than what the current Vim
+			version supports E999 will be given.  You either need
+			to rewrite the script to make it work with an older
+			Vim version, or update Vim to a newer version.  See
+			|vimscript-version| for what changed between versions.
+
 						*:scr* *:scriptnames*
 :scr[iptnames]		List all sourced script names, in the order they were
 			first sourced.  The number is used for the script ID