Update azure-pipelines.yml

azure-pipelines.yml

@@ -7,21 +7,21 @@ trigger:
 jobs:
 - job: Windows
   pool:
-    vmImage: 'vs2017-win2016'
+    vmImage: 'VS2017-Win2016'
   steps:
   - template: build.yml
 
 - job: macOS
   pool:
-    vmImage: 'macos-10.13'
+    vmImage: 'macOS-latest'
   steps:
   - template: build.yml
 
 - job: Linux
   pool:
-    vmImage: 'ubuntu-16.04'
+    vmImage: 'Ubuntu-18.04'
   dependsOn:
   - Windows
   - macOS
   steps:
-  - template: build.yml
+  - template: build.yml