Update Mac pool

Author: Danny McCormick

azure-pipelines.yml

@@ -34,9 +34,9 @@ jobs:
     displayName: 'Publish npm artifact'
     condition: and(succeeded(), eq(variables['Build.SourceBranch'], 'refs/heads/master'))
 
-- job: 'MacOS_1013'
+- job: 'MacOS_1014'
   pool:
-    vmImage: 'macOS-10.13'
+    vmImage: 'macOS-10.14'
 
   steps:
   - template: azure-pipelines-steps.yml