update iguana for gcc 8.3

[Jacyking]

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[codecov-commenter]

Codecov Report

Attention: 41 lines in your changes are missing coverage. Please review.

Comparison is base (eb9e436) 40.09% compared to head (2920788) 40.09%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #123   +/-   ##
=======================================
  Coverage   40.09%   40.09%           
=======================================
  Files          22       22           
  Lines        2871     2871           
=======================================
  Hits         1151     1151           
  Misses       1720     1720           

Files	Coverage Δ
iguana/define.h	0.00% <ø> (ø)
iguana/reflection.hpp	100.00% <ø> (ø)
iguana/util.hpp	0.00% <ø> (ø)
iguana/detail/charconv.h	0.00% <0.00%> (ø)
iguana/detail/utf.hpp	0.00% <0.00%> (ø)
iguana/json_util.hpp	0.00% <0.00%> (ø)
iguana/json_reader.hpp	0.00% <0.00%> (ø)

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