CI: Restore Python 3.8 Azure tests

Author: effigies

azure-pipelines.yml

@@ -3,7 +3,7 @@ jobs:
 - template: .azure-pipelines/windows.yml
   parameters:
     name: Windows
-    vmImage: vs2017-win2016
+    vmImage: windows-2019
     matrix:
       py35-x86:
         PYTHON_VERSION: '3.5'
@@ -28,10 +28,9 @@ jobs:
       py37-x64:
         PYTHON_VERSION: '3.7'
         PYTHON_ARCH: 'x64'
-      # Pending https://github.com/microsoft/azure-pipelines-image-generation/issues/1317
-      # py38-x86:
-      #   PYTHON_VERSION: '3.8'
-      #   PYTHON_ARCH: 'x86'
-      # py38-x64:
-      #   PYTHON_VERSION: '3.8'
-      #   PYTHON_ARCH: 'x64'
+      py38-x86:
+        PYTHON_VERSION: '3.8'
+        PYTHON_ARCH: 'x86'
+      py38-x64:
+        PYTHON_VERSION: '3.8'
+        PYTHON_ARCH: 'x64'