fix escape bug in json::parse_item

[bbbgan]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.20 🎉

Comparison is base (cc4c33a) 43.04% compared to head (b52c4d2) 43.25%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #161      +/-   ##
==========================================
+ Coverage   43.04%   43.25%   +0.20%     
==========================================
  Files          36       36              
  Lines        6442     6425      -17     
==========================================
+ Hits         2773     2779       +6     
+ Misses       3669     3646      -23     

Impacted Files	Coverage Δ
iguana/json_reader.hpp	77.90% <ø> (+3.46%)	⬆️
iguana/detail/dragonbox_to_chars.h	32.29% <100.00%> (+2.04%)	⬆️
iguana/error_code.h	64.28% <100.00%> (ø)
test/unit_test.cpp	99.52% <100.00%> (ø)

... and 1 file with indirect coverage changes

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