Add mapping of steamid and userid

[niekcandaele]

No description provided.

[codecov-commenter]

Codecov Report

Merging #486 (c573ba1) into master (a654ff6) will increase coverage by 1.18%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #486      +/-   ##
==========================================
+ Coverage   94.33%   95.52%   +1.18%     
==========================================
  Files           1        2       +1     
  Lines          53       67      +14     
  Branches        7       11       +4     
==========================================
+ Hits           50       64      +14     
  Misses          1        1              
  Partials        2        2              

Impacted Files	Coverage Δ
lib/handleSteamId.ts	100.00% <100.00%> (ø)
lib/index.ts	94.44% <100.00%> (+0.10%)	⬆️

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