Prep for migration to GitHub Actions CI/CD

.github/workflows/test.yml

+name: Run tests
+on: [push, pull_request]
+
+jobs:
+  run:
+    name: Node ${{ matrix.node }}
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node: [8, 10, 12]
+
+    steps:
+    - uses: actions/checkout@master
+      with:
+        fetch-depth: 3
+
+    - name: Set Node.js version
+      uses: actions/setup-node@v1.1.0
+      with:
+        version: ${{ matrix.node }}
+
+    - run: node --version
+    - run: npm --version
+    - run: java -version
+
+    - name: Install npm dependencies
+      run: npm ci
+
+    - name: Run tests
+      run: npm test
+
+    - name: Run BrowserStack tests
+      run: npm run js-test-cloud
+      if: matrix.node == 10 && github.repository == 'twbs/bootstrap' && github.event_name == 'push'
+      env:
+        BROWSER_STACK_ACCESS_KEY: "${{ secrets.BROWSER_STACK_ACCESS_KEY }}"
+        BROWSER_STACK_USERNAME: "${{ secrets.BROWSER_STACK_USERNAME }}"
+
+    - name: Run Coveralls
+      run: npm run coveralls
+      if: matrix.node == 10
+      env:
+        COVERALLS_REPO_TOKEN: "${{ secrets.COVERALLS_REPO_TOKEN }}"

.travis.yml

-addons:
-  chrome: stable
-language: node_js
-git:
-  depth: 3
-node_js:
-  - "8"
-  - "10"
-  - "12"
-before_script:
-  - google-chrome-stable --product-version
-script:
-  - npm test || travis_terminate 1
-  - if [[ "$TRAVIS_NODE_VERSION" = "10" && "$TRAVIS_EVENT_TYPE" = "push" && ! `git log --format=%B --no-merges -n 1 | grep '\[skip browser\]'` ]]; then npm run js-test-cloud; fi
-after_success:
-  - if [[ "$TRAVIS_NODE_VERSION" = "10" ]]; then npm run coveralls; fi
-cache: npm
-notifications:
-  email: false

README.md

@@ -53,7 +53,7 @@ Read the [Getting started page](https://getbootstrap.com/docs/4.3/getting-starte
 
 ## Status
 
-[![Build Status](https://img.shields.io/travis/twbs/bootstrap/master.svg)](https://travis-ci.org/twbs/bootstrap)
+![Build Status](https://action-badges.now.sh/twbs/bootstrap)
 [![npm version](https://img.shields.io/npm/v/bootstrap.svg)](https://www.npmjs.com/package/bootstrap)
 [![Gem version](https://img.shields.io/gem/v/bootstrap.svg)](https://rubygems.org/gems/bootstrap)
 [![Meteor Atmosphere](https://img.shields.io/badge/meteor-twbs%3Abootstrap-blue.svg)](https://atmospherejs.com/twbs/bootstrap)