Feat: nested params

[molefrog]

Closes #409
Parent route parameters now appear in params returned from useParams(). New values overwrite old ones.

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[github-actions]

size-limit report 📦

Path	Size
packages/wouter/esm/index.js	2.23 KB (+2.43% 🔺)
packages/wouter/esm/use-browser-location.js	622 B (0%)
packages/wouter/esm/memory-location.js	798 B (0%)
packages/wouter/esm/use-hash-location.js	709 B (0%)
packages/wouter-preact/esm/index.js	2.12 KB (+2.37% 🔺)
packages/wouter-preact/esm/use-browser-location.js	552 B (0%)
packages/wouter-preact/esm/use-hash-location.js	618 B (0%)
packages/wouter-preact/esm/memory-location.js	702 B (0%)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (fa5f6b1) to head (3c12a18).

Additional details and impacted files

@@            Coverage Diff            @@
##                v3      #461   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines            1         1           
=========================================
  Hits             1         1           

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