Support multiple paths for a single verb on an endpoint

[trestletech]

Closes #191

[codecov-io]

Codecov Report

Merging #203 into master will increase coverage by 0.01%.
The diff coverage is 96.15%.

@@            Coverage Diff             @@
##           master     #203      +/-   ##
==========================================
+ Coverage   88.16%   88.18%   +0.01%     
==========================================
  Files          24       24              
  Lines        1191     1193       +2     
==========================================
+ Hits         1050     1052       +2     
  Misses        141      141

Impacted Files	Coverage Δ
R/plumber-step.R	82.71% <ø> (ø)	⬆️
R/parse-block.R	96.77% <96.15%> (+0.03%)	⬆️

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