CI: use macOS 10.14 #151
CI: use macOS 10.14 #151

It seems that azure pipeline has stopped support for macOS 10.13. Now only 10.14 and 10.15 are available.

https://docs.microsoft.com/en-us/azure/devops/pipelines/agents/hosted?view=azure-devops#use-a-microsoft-hosted-agent
neovim/node-client,neovim/node-client