Replace Azure DevOps CI workflow with GitHub Action.

.github/workflows/nodejs.yml

@@ -1,4 +1,4 @@
-name: Node.js CI
+name: CI
 
 on: [push, pull_request]
 

.npmignore

@@ -1,15 +1,15 @@
 .eslintignore
 .eslintrc.json
-example
+.github
 .markdownlint.json
 .nycrc.json
 .nyc_output
 .travis.yml
 .vscode
-azure-pipelines.yml
 coverage
 demo/*
 !demo/markdownlint-browser.js
+example
 lib-es3
 npm-debug.log
 test

README.md

@@ -3,7 +3,7 @@
 > A Node.js style checker and lint tool for Markdown/CommonMark files.
 
 [![npm version][npm-image]][npm-url]
-[![CI Status][devops-image]][devops-url]
+[![CI Status][ci-image]][ci-url]
 [![License][license-image]][license-url]
 
 ## Install
@@ -813,7 +813,7 @@ See [CONTRIBUTING.md](CONTRIBUTING.md) for more information.
 
 [npm-image]: https://img.shields.io/npm/v/markdownlint.svg
 [npm-url]: https://www.npmjs.com/package/markdownlint
-[devops-image]: https://img.shields.io/azure-devops/build/DavidAnson/5b2bff85-0fe6-47b4-a561-fa87be89f032/1/master.svg?label=tests
-[devops-url]: https://dev.azure.com/DavidAnson/markdownlint-ci/_build/latest?definitionId=1&branchName=master
+[ci-image]: https://github.com/DavidAnson/markdownlint/workflows/CI/badge.svg?branch=master
+[ci-url]: https://github.com/DavidAnson/markdownlint/actions?query=branch%3Amaster
 [license-image]: https://img.shields.io/npm/l/markdownlint.svg
 [license-url]: https://opensource.org/licenses/MIT

azure-pipelines.yml

@@ -1,47 +0,0 @@
-# Azure DevOps Pipeline for Node.js
-# https://docs.microsoft.com/azure/devops/pipelines/languages/javascript
-
-strategy:
-  matrix:
-    linux_node_8:
-      imageName: 'ubuntu-latest'
-      node_version: 8.x
-    linux_node_10:
-      imageName: 'ubuntu-latest'
-      node_version: 10.x
-    linux_node_12:
-      imageName: 'ubuntu-latest'
-      node_version: 12.x
-    macos_node_8:
-      imageName: 'macos-latest'
-      node_version: 8.x
-    macos_node_10:
-      imageName: 'macos-latest'
-      node_version: 10.x
-    macos_node_12:
-      imageName: 'macos-latest'
-      node_version: 12.x
-    windows_node_8:
-      imageName: 'windows-latest'
-      node_version: 8.x
-    windows_node_10:
-      imageName: 'windows-latest'
-      node_version: 10.x
-    windows_node_12:
-      imageName: 'windows-latest'
-      node_version: 12.x
-
-pool:
-  vmImage: $(imageName)
-
-steps:
-- task: NodeTool@0
-  inputs:
-    versionSpec: $(node_version)
-  displayName: 'Install Node.js'
-
-- script: 'npm install --no-package-lock'
-  displayName: 'Install Dependencies'
-
-- script: 'npm run ci'
-  displayName: 'Run Tests'