fix(route-alis): preserve route previous aliases

[j1gs4w]

Instead of replacing the alias of the route, add an additional alias.
In case other modules create alias or other custom implementations use alias for routes too.

[codecov]

Codecov Report

Merging #91 into master will decrease coverage by 0.23%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master      #91      +/-   ##
==========================================
- Coverage   68.58%   68.35%   -0.24%     
==========================================
  Files           4        4              
  Lines         156      158       +2     
  Branches       41       42       +1     
==========================================
+ Hits          107      108       +1     
- Misses         36       37       +1     
  Partials       13       13

Impacted Files	Coverage Δ
lib/module.js	73.33% <66.66%> (-0.64%)	⬇️

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