test: remove appveyor config (#1357)
test: remove appveyor config (#1357)


googleapis/google-api-nodejs-client,googleapis/google-api-nodejs-client,sqrrrl/google-api-nodejs-client,sqrrrl/google-api-nodejs-client,stems/google-api-nodejs-client,stems/google-api-nodejs-client,sqrrrl/google-api-nodejs-client,sqrrrl/google-api-nodejs-client,stems/google-api-nodejs-client,sqrrrl/google-api-nodejs-client,googleapis/google-api-nodejs-client,stems/google-api-nodejs-client,stems/google-api-nodejs-client