Move to GitHub Actions (#99)

Ref Level/community#99

.github/workflows/test.yml

@@ -0,0 +1,28 @@
+name: Test
+on: [push, pull_request]
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node: [6, 8, 10]
+    name: Node ${{ matrix.node }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Fetch tags
+        run: git fetch --tags
+      - name: Use node ${{ matrix.node }}
+        uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node }}
+      - name: Install
+        run: npm install
+      - name: Test
+        run: npm run test
+      - name: Coverage
+        run: npm run coverage
+      - name: Codecov
+        uses: codecov/codecov-action@v1
+        with:
+          file: coverage/lcov.info

README.md

@@ -5,9 +5,9 @@
 [![level badge][level-badge]](https://github.com/Level/awesome)
 [![npm](https://img.shields.io/npm/v/subleveldown.svg?label=&logo=npm)](https://www.npmjs.com/package/subleveldown)
 [![Node version](https://img.shields.io/node/v/subleveldown.svg)](https://www.npmjs.com/package/subleveldown)
-[![Travis](https://img.shields.io/travis/com/Level/subleveldown.svg?logo=travis&label=)](https://travis-ci.com/Level/subleveldown)
+[![Test](https://github.com/Level/subleveldown/actions/workflows/test.yml/badge.svg)](https://github.com/Level/subleveldown/actions/workflows/test.yml)
 [![npm](https://img.shields.io/npm/dm/subleveldown.svg?label=dl)](https://www.npmjs.com/package/subleveldown)
-[![Coverage Status](https://coveralls.io/repos/github/Level/subleveldown/badge.svg)](https://coveralls.io/github/Level/subleveldown)
+[![codecov](https://codecov.io/gh/Level/subleveldown/branch/master/graph/badge.svg)](https://codecov.io/gh/Level/subleveldown)
 [![JavaScript Style Guide](https://img.shields.io/badge/code_style-standard-brightgreen.svg)](https://standardjs.com)
 [![Backers on Open Collective](https://opencollective.com/level/backers/badge.svg?color=orange)](#backers)
 [![Sponsors on Open Collective](https://opencollective.com/level/sponsors/badge.svg?color=orange)](#sponsors)

package.json

@@ -7,7 +7,7 @@
   "main": "index.js",
   "scripts": {
     "test": "standard && hallmark && (nyc -s node test | faucet) && nyc report",
-    "coverage": "nyc report --reporter=text-lcov | coveralls",
+    "coverage": "nyc report -r lcovonly",
     "hallmark": "hallmark --fix",
     "dependency-check": "dependency-check --no-dev .",
     "prepublishOnly": "npm run dependency-check"
@@ -25,7 +25,6 @@
   },
   "devDependencies": {
     "after": "^0.8.2",
-    "coveralls": "^3.0.2",
     "dependency-check": "^4.1.0",
     "faucet": "^0.0.1",
     "hallmark": "^3.1.0",