Switch to latest CI images (#60)

* Switch to latest CI images

* Switch back to older images for older python versions

Author: adrianeboyd

azure-pipelines.yml

@@ -10,40 +10,40 @@ jobs:
   strategy:
     matrix:
       Python36Linux:
-        imageName: 'ubuntu-18.04'
+        imageName: 'ubuntu-latest'
         python.version: '3.6'
       Python36Windows:
-        imageName: 'vs2017-win2016'
+        imageName: 'windows-latest'
         python.version: '3.6'
       Python36Mac:
-        imageName: 'macos-10.14'
+        imageName: 'macos-10.15'
         python.version: '3.6'
       Python38Linux:
-        imageName: 'ubuntu-18.04'
+        imageName: 'ubuntu-latest'
         python.version: '3.8'
       Python38Windows:
-        imageName: 'vs2017-win2016'
+        imageName: 'windows-latest'
         python.version: '3.8'
       Python38Mac:
-        imageName: 'macos-10.14'
+        imageName: 'macos-latest'
         python.version: '3.8'
       Python39Linux:
-        imageName: 'ubuntu-18.04'
+        imageName: 'ubuntu-latest'
         python.version: '3.9'
       Python39Windows:
-        imageName: 'vs2017-win2016'
+        imageName: 'windows-latest'
         python.version: '3.9'
       Python39Mac:
-        imageName: 'macos-10.14'
+        imageName: 'macos-latest'
         python.version: '3.9'
       Python310Linux:
-        imageName: 'ubuntu-18.04'
+        imageName: 'ubuntu-latest'
         python.version: '3.10'
       Python310Windows:
-        imageName: 'vs2017-win2016'
+        imageName: 'windows-latest'
         python.version: '3.10'
       Python310Mac:
-        imageName: 'macos-10.15'
+        imageName: 'macos-latest'
         python.version: '3.10'
     maxParallel: 4
   pool: