Deprecate sh_scrapy.compat module

[elacuesta]

Use scrapy.utils.python.to_bytes/to_unicode instead, available at least since Scrapy 1.6 which is currently the minimum required version.

[codecov]

Codecov Report

Merging #67 (65f1ec7) into master (026fec7) will increase coverage by 0.46%.
The diff coverage is 100.00%.

❗ Current head 65f1ec7 differs from pull request most recent head e2d8545. Consider uploading reports for the commit e2d8545 to get more accurate results

@@            Coverage Diff             @@
##           master      #67      +/-   ##
==========================================
+ Coverage   95.06%   95.53%   +0.46%     
==========================================
  Files          14       14              
  Lines         750      739      -11     
==========================================
- Hits          713      706       -7     
+ Misses         37       33       -4     

Impacted Files	Coverage Δ
sh_scrapy/compat.py	100.00% <100.00%> (+12.90%)	⬆️
sh_scrapy/env.py	100.00% <100.00%> (ø)
sh_scrapy/extension.py	100.00% <100.00%> (ø)
sh_scrapy/hsref.py	100.00% <100.00%> (ø)
sh_scrapy/log.py	98.09% <100.00%> (ø)
sh_scrapy/settings.py	94.77% <100.00%> (ø)

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[MattVieira]

I believe everything is ok, I don't see any limitations, however, I don't feel comfortable evaluating the pull request alone. This time, are we going to wait for another approver?