Switch to github workflow for testing

.github/workflows/test.yml

@@ -0,0 +1,30 @@
+name: Test
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  npm-test:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: ['10', '12', '14']
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - uses: actions/setup-node@v1
+      with:
+        node-version: ${{ matrix.node-version }}
+
+    - run: |
+        npm install
+        npm test
+
+    - uses: coverallsapp/github-action@master
+      with:
+        github-token: ${{ secrets.GITHUB_TOKEN }}

README.md

@@ -1,6 +1,6 @@
 # gulp-postcss
 
-[![Build Status](https://img.shields.io/travis/postcss/gulp-postcss.svg)](https://travis-ci.org/postcss/gulp-postcss)
+![Build Status](https://github.com/postcss/gulp-postcss/actions/workflows/test.yml/badge.svg?branch=main)
 [![Coverage Status](https://img.shields.io/coveralls/postcss/gulp-postcss.svg)](https://coveralls.io/r/postcss/gulp-postcss)
 
 [PostCSS](https://github.com/postcss/postcss) gulp plugin to pipe CSS through

package.json

@@ -20,7 +20,6 @@
     "node": "^10 || ^12 || >=14"
   },
   "scripts": {
-    "coveralls": "coveralls < coverage/lcov.info",
     "pretest": "eslint *.js",
     "test": "nyc mocha test.js"
   },
@@ -47,7 +46,6 @@
     "vinyl-sourcemaps-apply": "^0.2.1"
   },
   "devDependencies": {
-    "coveralls": "^3.0.3",
     "eslint": "^5.16.0",
     "gulp-sourcemaps": "^2.6.5",
     "mocha": "^5.2.0",