upgrade the json gem from 1.8.3 to 1.8.6 to get ruby >=2.4 support

[phallstrom]

Version 1.8.3 of the json gem isn't compatable with ruby 2.4 and later.
see: ruby/json#303

Specifically require the json gem to ensure we fetch a compatible
version.

[colindean]

What problem did you encounter in brew bundle that led you to submit this?

[phallstrom]

I was going to resurrect my work from #297 and was unable to install/run tests locally on a fresh copy of master.

[colindean]

Some time has passed since then. brew bundle dump --describe does what #297 would do now. Try it out!

[phallstrom]

Well, look at that :) In that case... consider #372

[colindean]

This is now obsolete, #372 documented --describe, which was the intent of #297, and this PR was driving toward that while building brew on Ruby 2.4.

[phallstrom]

Not sure this is obsolete... I still can't bundle install if I check out this repo.

[colindean]

@phallstrom Let's handle that as a separate bug issue.

[phallstrom]

@colindean separate issue? Not sure I understand.. this PR does nothing but update the gem version which is necessary to install it with ruby >= 2.4

[MikeMcQuaid]

brew bundle does not use Ruby 2.4 or bundle install at runtime. Adjust your local ruby version accordingly if you're having trouble running rake with this repository for development.

[phallstrom]

🤦 I just went to verify this and I don't know how, but the version I was checking against was really really old. Sorry for the noise.

[MikeMcQuaid]

@phallstrom No worries!