Allow '?' character in route path

[andrewmilson]

No description provided.

[codecov]

Codecov Report

Merging #1792 into master will decrease coverage by 0.44%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1792      +/-   ##
==========================================
- Coverage   80.48%   80.04%   -0.45%     
==========================================
  Files          38       38              
  Lines        7544     7497      -47     
==========================================
- Hits         6072     6001      -71     
- Misses        996     1019      +23     
- Partials      476      477       +1

Impacted Files	Coverage Δ
scan/scanner.go	72.05% <ø> (ø)	⬆️
generator/client.go	68.18% <0%> (-11.45%)	⬇️
generator/shared.go	80.74% <0%> (-2.91%)	⬇️
generator/bindata.go	66.73% <0%> (-1.62%)	⬇️
generator/types.go	90.84% <0%> (ø)	⬆️
generator/debug.go	100% <0%> (ø)	⬆️
cmd/swagger/commands/generate/client.go	100% <0%> (ø)	⬆️
generator/model.go	84.32% <0%> (+0.12%)	⬆️
scan/parameters.go	78.37% <0%> (+0.14%)	⬆️
generator/operation.go	89.33% <0%> (+0.2%)	⬆️
... and 4 more

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[casualjim]

can you sign off on the commit? https://github.com/go-swagger/go-swagger/pull/1792/checks?check_run_id=30601953