fix!: store job id instead of job instance

[callmehiphop]

Fixes #463

• Tests and linter pass
• Code coverage does not decrease (if any source code was changed)
• Appropriate docs were updated (if necessary)

[callmehiphop]

@cmath if you want to give this a test drive to see if it resolves your issue, that would be awesome!

[codecov]

Codecov Report

Merging #464 into master will increase coverage by 0.42%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #464      +/-   ##
==========================================
+ Coverage   99.42%   99.85%   +0.42%     
==========================================
  Files           5        5              
  Lines         700      701       +1     
  Branches      194      194              
==========================================
+ Hits          696      700       +4     
+ Misses          3        1       -2     
+ Partials        1        0       -1

Impacted Files	Coverage Δ
src/index.ts	99.62% <100%> (+1.12%)	⬆️

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[callmehiphop]

Closing in favor of #465 which is not a breaking change.