chore: update README.md

[dragon-fish]

• Remove archived package: koishi-plugin-iqdb This plugin is now part of the official plugin. Please use koishi-plugin-image-search instead.
• Update repo URL: koishi-plugin-genshin

[codecov]

Codecov Report

Merging #177 (a3596be) into master (c3f3c2d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #177   +/-   ##
=======================================
  Coverage   90.91%   90.91%           
=======================================
  Files          53       53           
  Lines       10168    10168           
  Branches     2002     2002           
=======================================
  Hits         9244     9244           
  Misses        924      924           

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[shigma]

Also you can add koishi-plugin-shell :)