Fix #183: Move URI prefix to `RouteCollection`

[rustamwin]

Q	A
Is bugfix?	✔️/❌
New feature?	✔️/❌
Breaks BC?	✔️/❌
Fixed issues	comma-separated list of tickets # fixed by the PR, if any

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.02 :tada:

Comparison is base (805f0d8) 97.61% compared to head (dda40ba) 97.64%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #192      +/-   ##
============================================
+ Coverage     97.61%   97.64%   +0.02%     
- Complexity      140      142       +2     
============================================
  Files             9        9              
  Lines           419      424       +5     
============================================
+ Hits            409      414       +5     
  Misses           10       10              

Impacted Files	Coverage Δ
src/RouteCollection.php	100.00% <100.00%> (ø)

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