Export CodeAndMessage function for general use

[flimzy]

Or maybe this function should live somewhere else entirely? Sharing utility functions from within a middleware package seems a bit backwards in a way...

[codecov]

Codecov Report

Merging #5 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master      #5   +/-   ##
======================================
  Coverage    90.8%   90.8%           
======================================
  Files           3       3           
  Lines          87      87           
======================================
  Hits           79      79           
  Misses          5       5           
  Partials        3       3

Impacted Files	Coverage Δ
httperrMiddleware/error.go	87.23% <100%> (ø)	⬆️

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[flimzy]

Perhaps this functionality could/should live in the httperr package? Perhaps (at least partly) in the form of extended functionality of httperr.StatusCode? That function could be made to understand echo errors. But that would, I believe, mean that Desk could no longer use the same version of httperr as other projects, until Desk is on Echo 3.

Other suggestions?

[arp242]

We actually made the same change in Desk last week. I think it's fine for now if it solves an immediate problem; don't need to overthink it. Can always change it later.