Add missing custom params for various endpoints

[Archomeda]

This will add support for:

• ?since to /v2/guild/:id/log
• ?world to /v2/wvw/matches, /v2/wvw/matches/overview, /v2/wvw/matches/scores, /v2/wvw/matches/stats

I hope I didn't mess anything up while writing this during the API downtime.

[codecov-io]

Codecov Report

Merging #23 into master will not change coverage. The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #23   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          48     48           
  Lines        1039   1044    +5     
=====================================
+ Hits         1039   1044    +5

Impacted Files	Coverage Δ
src/endpoints/wvw.js	100% <100%> (ø)	:arrow_up:
src/endpoints/guild.js	100% <100%> (ø)	:arrow_up:

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[queicherius]

Thank you, merged, will be in the next release! <3