Display Link Arrows using custom emoji

[kevinlul]

Closes #311

[codecov]

Codecov Report

Attention: Patch coverage is 97.22222% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 46.67%. Comparing base (4969f7e) to head (331c4cb).
Report is 1 commits behind head on master.

Files	Patch %	Lines
src/card.ts	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #449      +/-   ##
==========================================
- Coverage   46.86%   46.67%   -0.19%     
==========================================
  Files          33       33              
  Lines        4600     4578      -22     
  Branches      135      134       -1     
==========================================
- Hits         2156     2137      -19     
+ Misses       2443     2441       -2     
+ Partials        1        0       -1     

Flag	Coverage Δ
contract	?
unit	46.67% <97.22%> (+0.76%)	⬆️

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