fix: scheduler Delay timer

[fanjindong]

[codecov-io]

Codecov Report

Merging #6 into master will not change coverage. The diff coverage is 100%.

@@           Coverage Diff           @@
##           master       #6   +/-   ##
=======================================
  Coverage   89.44%   89.44%           
=======================================
  Files           1        1           
  Lines         180      180           
=======================================
  Hits          161      161           
  Misses         14       14           
  Partials        5        5

Impacted Files	Coverage Δ
scheduler.go	89.44% <100%> (ø)	:arrow_up:

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