Mention contributors in the README

[Gallaecio]

No description provided.

[codecov]

Codecov Report

Merging #4956 (6e7ae78) into master (5a38639) will increase coverage by 0.50%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4956      +/-   ##
==========================================
+ Coverage   87.52%   88.02%   +0.50%     
==========================================
  Files         160      158       -2     
  Lines        9761     9719      -42     
  Branches     1440     1433       -7     
==========================================
+ Hits         8543     8555      +12     
+ Misses        955      910      -45     
+ Partials      263      254       -9     

Impacted Files	Coverage Δ
scrapy/utils/decorators.py	82.14% <0.00%> (-3.58%)	⬇️
scrapy/downloadermiddlewares/httpcompression.py	87.27% <0.00%> (-1.86%)	⬇️
scrapy/utils/gz.py	95.83% <0.00%> (-1.05%)	⬇️
scrapy/downloadermiddlewares/cookies.py	94.80% <0.00%> (-0.94%)	⬇️
scrapy/spiders/crawl.py	93.97% <0.00%> (-0.65%)	⬇️
scrapy/core/downloader/handlers/http11.py	92.46% <0.00%> (-0.57%)	⬇️
scrapy/link.py	100.00% <0.00%> (ø)
scrapy/utils/py36.py	100.00% <0.00%> (ø)
scrapy/http/request/__init__.py	97.26% <0.00%> (ø)
scrapy/downloadermiddlewares/httpproxy.py	100.00% <0.00%> (ø)
... and 21 more