support variant to_json

[bbbgan]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.11% 🎉

Comparison is base (dd57369) 42.82% compared to head (ddf3262) 42.94%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #205      +/-   ##
==========================================
+ Coverage   42.82%   42.94%   +0.11%     
==========================================
  Files          44       44              
  Lines        5296     5305       +9     
==========================================
+ Hits         2268     2278      +10     
+ Misses       3028     3027       -1     

Files Changed	Coverage Δ
iguana/json_util.hpp	20.00% <ø> (ø)
iguana/json_writer.hpp	100.00% <100.00%> (ø)
test/unit_test.cpp	99.64% <100.00%> (+0.01%)	⬆️

... and 1 file with indirect coverage changes

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