Add support for WebIRC (closes #33)

[qaisjp]

See https://kiwiirc.com/docs/webirc.

[codecov-io]

Codecov Report

Merging #34 into master will decrease coverage by 0.04%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master      #34      +/-   ##
==========================================
- Coverage   56.05%   56.01%   -0.05%     
==========================================
  Files          13       13              
  Lines        2335     2337       +2     
==========================================
  Hits         1309     1309              
- Misses        919      920       +1     
- Partials      107      108       +1

Impacted Files	Coverage Δ
client.go	70.81% <ø> (ø)	⬆️
conn.go	58.53% <0%> (-0.48%)	⬇️

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