Support GJ v4

[morgoth]

For context see bensheldon/good_job#1396 (reply in thread)

[mrrooijen]

Thanks, @morgoth (and @bensheldon for the additional information)!

I don’t have time to look into it this week, but I’ll hopefully get to it next week. At first glance, the changes look good, but I’ll have to update the test suite to verify. I’ll get back to you once I get to it.

[mrrooijen]

@morgoth I've pushed hirefire-resource 1.0.4 which includes the following changes:

• Support for good_job ~> 4
• Use performed_at instead of finished_at to mimic Sidekiq macro latency behavior

Diff: https://github.com/hirefire/hirefire-resource-ruby/compare/v1.0.3..v1.0.4

Thanks for your input!