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

@@ -1,22 +1,12 @@
-unused_args = false
-allow_defined_top = true
 
 globals = {
 	"spacesuit",
 }
 
 read_globals = {
-	-- Stdlib
-	string = {fields = {"split"}},
-	table = {fields = {"copy", "getn"}},
-	"call",
-
 	-- Minetest
 	"minetest",
-	"vector", "ItemStack",
-	"dump", "VoxelArea",
 
 	-- Deps
-	"unified_inventory", "default", "monitoring",
-	"armor"
+	"armor",
 }

readme.md

@@ -1,5 +1,7 @@
 
-# Intro
+# Spacesuit
+
+[![luacheck](https://github.com/mt-mods/spacesuit/workflows/luacheck/badge.svg)](https://github.com/mt-mods/spacesuit/actions)
 
 Spacesuit mod for minetest