AbstractRouteDef is importable from the web module (#3183)

[Maillol]

Add AbstractRouteDef to the __all__ tuple in order to allow importation from web module

According to the documentation, the user can use from aiohttp.web import AbstractRouteDef instead of from aiohttp.web_routedef import AbstractRouteDef

Related issue number

#3183

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• If you provide code modification, please add yourself to CONTRIBUTORS.txt
  • The format is <Name> <Surname>.
  • Please keep alphabetical order, the file is sorted by names.
• Add a new news fragment into the CHANGES folder
  • name it <issue_id>.<type> for example (588.bugfix)
  • if you don't have an issue_id change it to the pr id after creating the pr
  • ensure type is one of the following:
    • .feature: Signifying a new feature.
    • .bugfix: Signifying a bug fix.
    • .doc: Signifying a documentation improvement.
    • .removal: Signifying a deprecation or removal of public API.
    • .misc: A ticket has been closed, but it is not of interest to users.
  • Make sure to use full sentences with correct case and punctuation, for example: "Fix issue with non-ascii contents in doctest text files."

[codecov-io]

Codecov Report

Merging #3188 into master will decrease coverage by 0.03%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3188      +/-   ##
==========================================
- Coverage   98.11%   98.07%   -0.04%     
==========================================
  Files          43       43              
  Lines        7853     7853              
  Branches     1354     1354              
==========================================
- Hits         7705     7702       -3     
- Misses         57       59       +2     
- Partials       91       92       +1

Impacted Files	Coverage Δ
aiohttp/web_routedef.py	100% <100%> (ø)	⬆️
aiohttp/tcp_helpers.py	90% <0%> (-6.67%)	⬇️
aiohttp/client_reqrep.py	97.47% <0%> (-0.17%)	⬇️

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[asvetlov]

Thanks!

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a [new issue] for related bugs.
If you feel like there's important points made in this discussion, please include those exceprts into that [new issue].
[new issue]: https://github.com/aio-libs/aiohttp/issues/new