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/src/ex_cmds.h b/src/ex_cmds.h
index eed4ce2..c080cbe 100644
--- a/src/ex_cmds.h
+++ b/src/ex_cmds.h
@@ -1269,6 +1269,9 @@
 EX(CMD_scriptencoding,	"scriptencoding", ex_scriptencoding,
 			WORD1|TRLBAR|CMDWIN,
 			ADDR_LINES),
+EX(CMD_scriptversion,	"scriptversion", ex_scriptversion,
+			WORD1|TRLBAR|CMDWIN,
+			ADDR_LINES),
 EX(CMD_scscope,		"scscope",	ex_scscope,
 			EXTRA|NOTRLCOM,
 			ADDR_LINES),