Use Actions

Author: wooorm

.github/workflows/main.yml

@@ -0,0 +1,21 @@
+name: main
+on:
+  - pull_request
+  - push
+jobs:
+  main:
+    name: ${{matrix.node}}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: dcodeIO/setup-node-nvm@master
+        with:
+          node-version: ${{matrix.node}}
+      - run: npm install
+      - run: npm test
+      - uses: codecov/codecov-action@v1
+    strategy:
+      matrix:
+        node:
+          - lts/dubnium
+          - node

.travis.yml

@@ -217,9 +217,9 @@ abide by its terms.
 
 <!-- Definitions -->
 
-[build-badge]: https://img.shields.io/travis/syntax-tree/mdast-util-footnote.svg
+[build-badge]: https://github.com/syntax-tree/mdast-util-footnote/workflows/main/badge.svg
 
-[build]: https://travis-ci.org/syntax-tree/mdast-util-footnote
+[build]: https://github.com/syntax-tree/mdast-util-footnote/actions
 
 [coverage-badge]: https://img.shields.io/codecov/c/github/syntax-tree/mdast-util-footnote.svg