rename class name to HourRotator

[kaidiren]

this file is Hour Rotator not day Rotator

Checklist

• [ ] npm test passes
• [ ] tests and/or benchmarks are included
• [ ] documentation is changed or added
• [ ] commit message follows commit guidelines

Affected core subsystem(s)

Description of change

[codecov[bot]]

Codecov Report

Merging #29 (1899199) into master (46b6876) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #29   +/-   ##
=======================================
  Coverage   96.19%   96.19%           
=======================================
  Files          14       14           
  Lines         210      210           
=======================================
  Hits          202      202           
  Misses          8        8           

Impacted Files	Coverage Δ
app/lib/hour_rotator.js	100.00% <100.00%> (ø)

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[elvinn]

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