Regex path variables

[jdietrich-tc]

adds new optional field to request object: pathVariables
it is a map of the path variable names (without the leading :) to the regexps that they must match

[codecov]

Codecov Report

Attention: Patch coverage is 12.50000% with 14 lines in your changes are missing coverage. Please review.

Project coverage is 66.27%. Comparing base (0745469) to head (af88c6b).
Report is 35 commits behind head on master.

❗ Current head af88c6b differs from pull request most recent head dc97091. Consider uploading reports for the commit dc97091 to get more accurate results

Files	Patch %	Lines
pkg/route/route.go	0.00%	12 Missing ⚠️
pkg/match/request.go	50.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #167      +/-   ##
==========================================
- Coverage   66.95%   66.27%   -0.69%     
==========================================
  Files          26       27       +1     
  Lines        1153     1269     +116     
==========================================
+ Hits          772      841      +69     
- Misses        330      369      +39     
- Partials       51       59       +8     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[jdietrich-tc]

I added the missing documentation for env.VARIABLE replacement variable support
(it also trigger a rerun of the CI which failed last time due to a rate limit)