Modernize

[Gallaecio]

Includes #51 since it is necessary to support the latest version of Scrapy.

Closes #51 (if not merged first), closes #50, fixes #49.

[kmike]

Nice!

[codecov]

Codecov Report

Attention: Patch coverage is 97.14286% with 1 line in your changes missing coverage. Please review.

Project coverage is 95.71%. Comparing base (28d2fd0) to head (7f0211c).
Report is 23 commits behind head on master.

Files with missing lines	Patch %	Lines
scrapy_deltafetch/middleware.py	97.05%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #52      +/-   ##
==========================================
+ Coverage   91.30%   95.71%   +4.40%     
==========================================
  Files           2        2              
  Lines          69       70       +1     
  Branches        9        8       -1     
==========================================
+ Hits           63       67       +4     
+ Misses          3        0       -3     
  Partials        3        3              

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