switch to github ci

.github/workflows/luacheck.yml

@@ -0,0 +1,17 @@
+name: luacheck
+
+on: [push, pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: apt
+      run: sudo apt-get install -y luarocks
+    - name: luacheck install
+      run: luarocks install --local luacheck
+    - name: luacheck run
+      run: $HOME/.luarocks/bin/luacheck ./

.travis.yml

@@ -1,11 +0,0 @@
-language: generic
-addons:
-  apt:
-    packages:
-    - luarocks
-before_install:
-  - luarocks install --local luacheck
-script:
-- $HOME/.luarocks/bin/luacheck ./mods
-notifications:
-  email: false

README.md

@@ -1,5 +1,7 @@
 # Minetest Game
 
+![](https://github.com/mt-mods/jumpdrive/workflows/luacheck/badge.svg)
+
 The default game bundled in the Minetest engine.  
 
 For further information, check