fix: routing header parameters must be urlencoded

[alexander-fenster]

Fixes #520 (cc: @schmidt-sebastian)

Turns out we had our very own implementation of querystring.stringify. Not anymore.

• 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 #521 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #521      +/-   ##
==========================================
+ Coverage   82.64%   82.65%   +0.01%     
==========================================
  Files          52       52              
  Lines        3474     3477       +3     
  Branches      267      267              
==========================================
+ Hits         2871     2874       +3     
  Misses        537      537              
  Partials       66       66

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

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update e398b8b...fc219d8. Read the comment docs.