fix issue 25

[GiggleLiu]

fix #25

[codecov]

Codecov Report

Merging #42 (4c7592c) into master (a1e07e6) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #42      +/-   ##
==========================================
+ Coverage   92.28%   92.33%   +0.04%     
==========================================
  Files           6        6              
  Lines         324      326       +2     
==========================================
+ Hits          299      301       +2     
  Misses         25       25              

Impacted Files	Coverage Δ
src/iterate_control.jl	98.00% <100.00%> (+0.08%)	⬆️

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