feat(logs): adds command to access new logging functions

[philnash]

Initial attempt to add logs to twilio-run.

Much like the PR in serverless-api this doesn't cover all the filters available for the logs endpoint. It is a first attempt and could do with a review.

It adds the logs command.

npx twilio-run logs --tail

The above command will pick up the project config and stream the logs from the functions in the service and environment (dev by default).

Contributing to Twilio

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• I acknowledge that all my contributions will be made under the project's license.

[philnash]

Travis CI seems to be having issues with installing/running Node 10. @dkundel Can you nudge Travis and kick the build off again to make it pass please.

[dkundel]

Left some additional comments but I think we are very close to shipping this :)

[philnash]

I believe this to be complete now. My concerns about not showing logs were unfounded.