ci: replace Travis CI with GitHub Actions (#251)

Author: bendrucker

.github/workflows/test.yml

@@ -0,0 +1,17 @@
+name: test
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+permissions:
+  contents: read
+
+jobs:
+  tests:
+    uses: ljharb/actions/.github/workflows/node.yml@main
+    with:
+      range: '>= 6'
+      command: npm run test-main

.travis.yml

@@ -1,4 +1,4 @@
-# browserify-shim [![build status](https://secure.travis-ci.org/thlorenz/browserify-shim.svg?branch=master)](http://travis-ci.org/thlorenz/browserify-shim)
+# browserify-shim
 
 ### Make CommonJS-Incompatible Files Browserifyable