update luacheck worlkflow and add badge

.github/workflows/luacheck.yml

@@ -1,14 +1,10 @@
 name: luacheck
-
-on: [push]
-
+on: [push, pull_request]
 jobs:
   build:
-
     runs-on: ubuntu-latest
-
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@master
     - name: apt
       run: sudo apt-get install -y luarocks
     - name: luacheck install

.luacheckrc

@@ -1,21 +1,5 @@
-unused_args = false
-allow_defined_top = true
 
 globals = {
-	"luaentity",
 	"minetest",
 	"xp_redo"
 }
-
-read_globals = {
-	-- Stdlib
-	string = {fields = {"split"}},
-	table = {fields = {"copy", "getn"}},
-
-	-- Minetest
-	"vector", "ItemStack",
-	"dump",
-
-	-- deps
-	"default", "mesecon"
-}

README.md

@@ -1,4 +1,6 @@
-# Ore ranks
+# Ore ranks for xp_redo
+
+[![luacheck](https://github.com/mt-mods/xp_redo_ranks_ores/workflows/luacheck/badge.svg)](https://github.com/mt-mods/xp_redo_ranks_ores/actions)
 
 ## Depends
 

ranks.lua

@@ -114,7 +114,7 @@ local suffixes = {
 
 -- #suffixes x #prefixes
 for _,prefix in pairs(prefixes) do
-	for i,suffix in pairs(suffixes) do
+	for _,suffix in pairs(suffixes) do
 		local xp = prefix.base_xp + (prefix.xp_modifier * suffix.xp_modifier)
 
 		xp_redo.register_rank({