Replace TravisCI with GitHub Actions

.github/workflows/ci.yml

@@ -0,0 +1,50 @@
+name: Continuous Integration
+
+on:
+  push:
+    branches:
+      - master
+      - main
+      - develop
+  pull_request:
+
+jobs:
+  ci:
+    runs-on: ubuntu-latest
+    name: node-${{ matrix.node }}
+    strategy:
+      matrix:
+        node: [ 12, 14 ]
+      fail-fast: false
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Get yarn cache directory path
+        id: yarn-cache-dir-path
+        run: echo "::set-output name=dir::$(yarn cache dir)"
+
+      - name: Setup yarn cache
+        uses: actions/cache@v2
+        id: yarn-cache
+        with:
+          path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
+          key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-yarn-
+
+      - name: Setup Node.js ${{ matrix.node }}
+        uses: actions/setup-node@v2-beta
+        with:
+          node-version: ${{ matrix.node }}
+
+      - name: Install dependencies
+        run: yarn install --pure-lockfile --prefer-offline
+
+      - name: Lint
+        run: yarn lint
+
+      - name: Test
+        run: yarn test
+        if: ${{ success() || failure() }}

README.md

@@ -1,7 +1,7 @@
 # A11y Contrast
 
 ![npm](https://img.shields.io/npm/v/a11y-contrast?style=flat-square)
-[![Travis](https://img.shields.io/travis/com/darekkay/a11y-contrast?style=flat-square)](https://travis-ci.com/darekkay/a11y-contrast)
+[![Build](https://img.shields.io/github/workflow/status/darekkay/a11y-contrast/Continuous%20Integration/master?style=flat-square)](https://github.com/darekkay/a11y-contrast/actions)
 [![license](https://img.shields.io/badge/license-MIT-green?style=flat-square)](https://github.com/darekkay/a11y-contrast/blob/master/LICENSE)
 
 A CLI utility to calculate/verify accessible [magic numbers](https://designsystem.digital.gov/design-tokens/color/overview/#magic-number) for a color palette. Read [my blog post](https://darekkay.com/blog/accessible-color-palette/) for some more information.