fix: emit encoding errors on user stream

[callmehiphop]

Fixes #491

• Tests and linter pass
• Code coverage does not decrease (if any source code was changed)
• Appropriate docs were updated (if necessary)

[codecov]

Codecov Report

Merging #492 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #492      +/-   ##
==========================================
+ Coverage   98.17%   98.18%   +0.01%     
==========================================
  Files           6        6              
  Lines         713      717       +4     
  Branches      171      171              
==========================================
+ Hits          700      704       +4     
  Misses          2        2              
  Partials       11       11

Impacted Files	Coverage Δ
src/request.ts	99.5% <100%> (ø)	⬆️

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