Enable travis

.luacheckrc

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+std = "lua51+minetest"
+unused_args = false
+allow_defined_top = true
+max_line_length = 90
+
+stds.minetest = {
+	read_globals = {
+		"DIR_DELIM",
+		"minetest",
+		"core",
+		"dump",
+		"vector",
+		"nodeupdate",
+		"VoxelManip",
+		"VoxelArea",
+		"PseudoRandom",
+		"ItemStack",
+		"default",
+		table = {
+			fields = {
+				"copy",
+			},
+		},
+	}
+}
+
+read_globals = {
+	"toolranks",
+	"farming",
+}

.pre-commit-config.yaml

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+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v2.3.0
+    hooks:
+      - id: end-of-file-fixer
+      - id: trailing-whitespace
+      - id: mixed-line-ending
+

.travis.yml

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+language: python
+
+install:
+  - sudo apt-get update -qq
+  - sudo apt-get install -qqq luarocks
+  - pip3 install pre-commit
+  - luarocks install --local luacheck
+
+script:
+  - pre-commit run --all-files
+  - $HOME/.luarocks/bin/luacheck .
+
+notifications:
+  email: false