<fix> (reflect2.go) import runtime

[aosting]

reflect2 没有import "runtime"

[codecov-commenter]

Codecov Report

Merging #15 into master will decrease coverage by 0.16%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master      #15      +/-   ##
==========================================
- Coverage   60.58%   60.42%   -0.17%     
==========================================
  Files          20       20              
  Lines         751      753       +2     
==========================================
  Hits          455      455              
- Misses        280      282       +2     
  Partials       16       16              

Impacted Files	Coverage Δ
reflect2.go	63.80% <0.00%> (-1.24%)	⬇️
type_map.go	47.45% <ø> (ø)

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