Set up CI with Azure Pipelines

azure-pipelines-template.yml

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+jobs:
+- job: ${{ parameters.name }}
+  pool: 
+    vmImage: ${{ parameters.vmImage }}
+  strategy:
+    matrix:
+      node_6_x:
+        node_version: 6.x
+      node_8_x:
+        node_version: 8.x
+      node_10_x:
+        node_version: 10.x
+    maxParallel: 3
+  steps:
+  - task: NodeTool@0
+    inputs:
+      versionSpec: $(node_version)
+    displayName: 'Install Node.js'
+
+  - script: yarn
+    displayName: 'Install dependencies'
+  - script: yarn test-ci
+    displayName: 'Run tests'
+  - script: yarn lint
+    displayName: 'Lint'

azure-pipelines.yml

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+jobs:
+- template: azure-pipelines-template.yml
+  parameters:
+    name: macOS
+    vmImage: macOS-10.13
+
+- template: azure-pipelines-template.yml
+  parameters:
+    name: Linux
+    vmImage: ubuntu-1604
+
+- template: azure-pipelines-template.yml
+  parameters:
+    name: Windows
+    vmImage: vs2017-win2016