main: support FIELDTYPE_BOOL in parser specific fields

[masatake]

Signed-off-by: Masatake YAMATO yamato@redhat.com

[coveralls]

Coverage increased (+0.007%) to 87.017% when pulling 214b1cc on masatake:support-bool-type-in-parser-specific-field into 01b9fc8 on universal-ctags:master.

[codecov]

Codecov Report

Merging #2668 into master will increase coverage by 0.00%.
The diff coverage is 92.85%.

@@           Coverage Diff           @@
##           master    #2668   +/-   ##
=======================================
  Coverage   86.91%   86.92%           
=======================================
  Files         183      183           
  Lines       39014    39053   +39     
=======================================
+ Hits        33909    33946   +37     
- Misses       5105     5107    +2     

Impacted Files	Coverage Δ
main/writer-json.c	92.13% <83.33%> (-1.54%)	⬇️
main/fmt.c	86.22% <87.50%> (+0.60%)	⬆️
main/parse.c	95.14% <100.00%> (+0.04%)	⬆️

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