Update built_with.rst

[rahulunair]

add repo-peek as a tool built using aiohttp

[codecov]

Codecov Report

Merging #5472 (857ff28) into master (10c8ce9) will decrease coverage by 1.15%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5472      +/-   ##
==========================================
- Coverage   97.17%   96.01%   -1.16%     
==========================================
  Files          41       41              
  Lines        8769     8759      -10     
  Branches     1404     1404              
==========================================
- Hits         8521     8410     -111     
- Misses        130      208      +78     
- Partials      118      141      +23     

Flag	Coverage Δ
unit	96.01% <ø> (-1.05%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
aiohttp/http_parser.py	91.71% <0.00%> (-5.53%)	⬇️
aiohttp/web_runner.py	92.34% <0.00%> (-5.41%)	⬇️
aiohttp/tcp_helpers.py	94.73% <0.00%> (-5.27%)	⬇️
aiohttp/http_writer.py	95.61% <0.00%> (-3.51%)	⬇️
aiohttp/pytest_plugin.py	94.26% <0.00%> (-3.19%)	⬇️
aiohttp/http_websocket.py	95.95% <0.00%> (-2.70%)	⬇️
aiohttp/worker.py	94.91% <0.00%> (-2.55%)	⬇️
aiohttp/web_protocol.py	84.10% <0.00%> (-2.32%)	⬇️
aiohttp/connector.py	94.61% <0.00%> (-1.91%)	⬇️
aiohttp/web.py	97.41% <0.00%> (-1.74%)	⬇️
... and 10 more

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