suggestion: set up greenkeeper for package updates

[trivikr]

Greenkeeper is a really good tool for automated dependency management.
We use it in fastify packages, and it's pretty helpful.

It can be set up once existing dependencies are updated.
Greenkeeper will take up task of updating dependencies (like lerna in PR #233 for example)

[AllanZhengYP]

@trivikr This is helpful. I think using it is much better than without this tool. A caveat is that most of our dependies lies in the dev dependencies which would only be used at release or doing code gen, we may not cover them in our github CI script and their breaking change may still break our release.

[AllanZhengYP]

@trivikr I'm going to setup the Greenkeeper. Do you think free version is enough for now?

[trivikr]

We were pending updating of Jest from v20->v24 prior to using greenkeeper
Jest was updated in #243

[trivikr]

The first PR to enable greenkeeper is at #248

[trivikr]

Closing as greenkeeper was set up in #248, and has posted update PRs since then (example #252)

[lock]

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