Move enzyme-adapter-react-16 to devDeps

[Kerumen]

enzyme-adapter-react-16 is only required for the tests, it shouldn't be included in the dependencies.

[coveralls]

Coverage remained the same at 90.741% when pulling 15f1edf on Kerumen:master into d4517c9 on seatgeek:master.

[danalloway]

LGTM

[kgregory]

This is correct

[chrisvoll]

@Kerumen thanks for the PR! Do you know why there were so many changes in package-lock.json? It should only contain { "dev": true } changes

[Kerumen]

@chrisvoll I don't know, I just moved the package and ran npm i.

Maybe npm changed his way to manage lock files since it has been generated. I have npm v6.2.0.

[geminiyellow]

hi @kgregory , why don't you merge this PR?
please merge it and publish a new version.

[kgregory]

@geminiyellow I am not a maintainer

[geminiyellow]

opps, sorry @kgregory , you review and approve the PR, so think you are maintainer.
and this library last merge is half year ago. is it still alive ? @garetht

[kgregory]

@geminiyellow I used this library in the past and was hopeful that it would be updated for React 16, but it doesn’t look good. I reviewed some issues and PRs to help out, but it doesn’t appear to have much support. Prove me wrong @garetht!