feature: support priority start_urls

[qshine]

No description provided.

[codecov]

Codecov Report

Merging #172 into master will increase coverage by 0.14%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #172      +/-   ##
==========================================
+ Coverage   92.89%   93.03%   +0.14%     
==========================================
  Files          18       18              
  Lines         732      747      +15     
  Branches       56       61       +5     
==========================================
+ Hits          680      695      +15     
  Misses         36       36              
  Partials       16       16              

Impacted Files	Coverage Δ
src/scrapy_redis/defaults.py	100.00% <100.00%> (ø)
src/scrapy_redis/spiders.py	96.38% <100.00%> (+0.43%)	⬆️
tests/test_spiders.py	100.00% <100.00%> (ø)

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[rmax]

Thanks!