Travis sucks; switch to Azure Pipelines

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.azure-pipelines/ci.yml

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+pr:
+  - master
+  - releases/*
+
+jobs:
+- template: run-tests.yml
+  parameters:
+    name: Py38_Ubuntu
+    vmImage: 'ubuntu-16.04'
+    pythonVersion: '3.8'
+- template: run-tests.yml
+  parameters:
+    name: Py38_Mac
+    vmImage: 'macOS-10.14'
+    pythonVersion: '3.8'
+- template: run-tests.yml
+  parameters:
+    name: Py38_Win
+    vmImage: 'windows-2019'
+    pythonVersion: '3.8'
+- template: run-tests.yml
+  parameters:
+    name: Py39_Ubuntu
+    vmImage: 'ubuntu-16.04'
+    pythonVersion: '3.9'
+- template: run-tests.yml
+  parameters:
+    name: Py39_Mac
+    vmImage: 'macOS-10.14'
+    pythonVersion: '3.9'
+- template: run-tests.yml
+  parameters:
+    name: Py39_Win
+    vmImage: 'windows-2019'
+    pythonVersion: '3.9'

.azure-pipelines/prepare-env.yml

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+parameters:
+  onlyPullRequests: false
+
+steps:
+- script: |
+    python -m pip install websockets uvloop 
+    python -m pip install pycodestyle
+    python -m pip install coveralls coverage
+    python -m pip install pytest pytest-asyncio Sphinx
+  displayName: Prepare general environment
+  condition: |
+    and(
+      succeeded(),
+      or(
+        eq(variables['Build.Reason'], 'PullRequest'),
+        eq(${{ parameters.onlyPullRequests }}, false)
+      )
+    )
+  enabled: true
+  continueOnError: false
+  failOnStderr: false

.azure-pipelines/run-tests.yml

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+parameters:
+  name: ''  # defaults for any parameters that aren't specified
+  vmImage: ''
+  pythonVersion: ''
+
+jobs:
+- job: ${{ parameters.name }}
+  pool:
+    vmImage: ${{ parameters.vmImage }}
+  steps:
+  - task: UsePythonVersion@0
+    inputs:
+      versionSpec: ${{ parameters.pythonVersion }}
+      addToPath: true
+      architecture: x64
+  - template: prepare-env.yml
+  - script: |
+      coverage run -m pytest --junitxml=junit/test-results.xml tests
+      coverage xml
+    displayName: 'Test with pytest'
+  - task: PublishTestResults@2
+    condition: succeededOrFailed()
+    inputs:
+      testResultsFiles: 'junit/test-*.xml'
+      testRunTitle: 'Publish test results for Python ${{ parameters.pythonVersion }}'
+  - task: PublishCodeCoverageResults@1
+    inputs:
+      codeCoverageTool: cobertura
+      summaryFileLocation: coverage.xml
+  - bash: |
+      COVERALLS_REPO_TOKEN=$(COVERALLS_REPO_TOKEN) coveralls
+    displayName: 'Coveralls'
+  - bash: |
+      pycodestyle --max-line-length=100 aiorpcx/*.py
+    condition: succeededOrFailed()
+    displayName: 'Validate code style'