[wip] remember stop updates until the vehicle arrives

[paulswartz]

No description provided.

[codecov]

Codecov Report

Merging #44 into master will decrease coverage by 0.97%.
The diff coverage is 74.35%.

@@            Coverage Diff             @@
##           master      #44      +/-   ##
==========================================
- Coverage   95.59%   94.61%   -0.98%     
==========================================
  Files          52       55       +3     
  Lines         818      855      +37     
==========================================
+ Hits          782      809      +27     
- Misses         36       46      +10

Impacted Files	Coverage Δ
...b/concentrate/reporter/vehicle_going_first_stop.ex	0% <0%> (ø)
...ib/concentrate/group_filter/vehicle_before_stop.ex	100% <100%> (ø)
lib/concentrate/supervisor.ex	100% <100%> (ø)	⬆️
...centrate/group_filter/cache/vehicle_before_stop.ex	92.3% <92.3%> (ø)

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