Does not work with NodeJS 10

[0xR]

Dialogflow-cli depends on grpc 1.7.3 indirectly. This version is not compatible with NodeJS 10 (grpc/grpc-node#400 (comment))

Upgrading the dialogflow package will probable resolve the issue.

└─┬ dialogflow-cli@1.0.4
  └─┬ dialogflow@0.1.0
    └─┬ google-gax@0.14.5
      └── grpc@1.7.3

[0xcaff]

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