city-symbol: Add more information to answer message

[hakatashi]

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 29 lines in your changes missing coverage. Please review.

Project coverage is 23.75%. Comparing base (cf5e1c5) to head (21f49d2).
Report is 14 commits behind head on master.

Files with missing lines	Patch %	Lines
city-symbol/index.ts	0.00%	29 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #932      +/-   ##
==========================================
- Coverage   23.93%   23.75%   -0.19%     
==========================================
  Files         180      182       +2     
  Lines       16003    16113     +110     
  Branches     3501     3524      +23     
==========================================
- Hits         3830     3827       -3     
- Misses      11522    11635     +113     
  Partials      651      651              

Flag	Coverage Δ
	23.75% <0.00%> (?)

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