Update Azure Windows image names (#1029)

Author: larsoner

azure-pipelines.yml

@@ -21,7 +21,7 @@ jobs:
         python ./bin/run_tests.py
 
 - job: windows_36
-  pool: {vmImage: 'vs2017-win2016'}
+  pool: {vmImage: 'windows-2019'}
   timeoutInMinutes: 180
   steps:
     - task: UsePythonVersion@0
@@ -32,7 +32,7 @@ jobs:
         python ./bin/run_tests.py
 
 - job: windows_38
-  pool: {vmImage: 'vs2017-win2016'}
+  pool: {vmImage: 'windows-2019'}
   timeoutInMinutes: 180
   steps:
     - task: UsePythonVersion@0

examples/azure-pipelines-minimal.yml

@@ -28,7 +28,7 @@ jobs:
       inputs: {pathtoPublish: wheelhouse}
 
 - job: windows
-  pool: {vmImage: 'vs2017-win2016'}
+  pool: {vmImage: 'windows-2019'}
   steps:
     - task: UsePythonVersion@0
     - bash: |