Drop custom router support

[asvetlov]

No description provided.

[kxepal]

😭 from aiohttp_traversal.

[asvetlov]

I feel your pain, we discussed it several times.
The parameter is deprecated already.

[codecov-io]

Codecov Report

Merging #3545 into master will decrease coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3545      +/-   ##
==========================================
- Coverage   97.93%   97.91%   -0.03%     
==========================================
  Files          43       43              
  Lines        8585     8581       -4     
  Branches     1385     1384       -1     
==========================================
- Hits         8408     8402       -6     
- Misses         73       74       +1     
- Partials      104      105       +1

Impacted Files	Coverage Δ
aiohttp/web_app.py	98.87% <100%> (-0.02%)	⬇️
aiohttp/web_request.py	97.44% <0%> (-0.52%)	⬇️

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[kxepal]

Yeah, I know. It's just quite strange to implement router thought router with the new design.

[kxepal]

👍 with a grief.

[lock]

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