Colon must be at beginning of path segment to denote a path parameter

[seanprince]

Signed-off-by: Sean Prince 7532924+seanprince@users.noreply.github.com

Tightened route parsing to treat colons appearing as the first character of a path segment as path parameters. Colons appearing elsewhere in the path segment are treated as a static path segment.

This PR fixes #162

[codecov]

Codecov Report

Merging #164 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #164      +/-   ##
==========================================
+ Coverage   80.13%   80.14%   +<.01%     
==========================================
  Files          40       40              
  Lines        2351     2352       +1     
==========================================
+ Hits         1884     1885       +1     
  Misses        361      361              
  Partials      106      106

Impacted Files	Coverage Δ
middleware/denco/router.go	93.57% <100%> (+0.02%)	⬆️

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