Use macOS 10.14 to work around isOSVersionAtLeast

Xanewok · Xanewok · commit 8789d8444e1c · 2019-08-01T00:10:46.000+02:00
https://jonnyzzz.com/blog/2018/06/05/link-error-2/
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
@@ -8,7 +8,7 @@ strategy:
     linux:
       imageName: 'ubuntu-16.04'
     mac:
-      imageName: 'macos-10.13'
+      imageName: 'macos-10.14'
     windows:
       imageName: 'vs2017-win2016'
 
