luacheckrc: Set Lua standard to 5.3 with 5.2 compat enabled

author: Kim Alvefur <zash@zash.se>
date: Sat, 08 Dec 2018 17:00:30 +0100
parent: 9464:eacdafd07217
child: 9690:75ed3403065d
--- a/.luacheckrc	Sat Dec 08 16:36:05 2018 +0100
+++ b/.luacheckrc	Sat Dec 08 17:00:30 2018 +0100
@@ -2,6 +2,7 @@
 codes = true
 ignore = { "411/err", "421/err", "411/ok", "421/ok", "211/_ENV", "431/log", "143/table", "113/unpack" }
 
+std = "lua53c"
 max_line_length = 150
 
 read_globals = {