feat: separate riot endpoints by category

[KnutZuidema]

resolves #30

[codecov]

Codecov Report

Merging #31 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #31   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           8     17    +9     
  Lines         978    934   -44     
=====================================
- Hits          978    934   -44

Impacted Files	Coverage Δ
golio.go	100% <ø> (ø)	⬆️
riot/league.go	100% <100%> (ø)
riot/third_party_code.go	100% <100%> (ø)
riot/tournament.go	100% <100%> (ø)
riot/status.go	100% <100%> (ø)
riot/champion_mastery.go	100% <100%> (ø)
riot/client.go	100% <100%> (ø)
riot/model.go	100% <100%> (ø)	⬆️
riot/summoner.go	100% <100%> (ø)
riot/match.go	100% <100%> (ø)
... and 12 more

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