It adds the ability to cancel multiple jobs

[rafaelcapucho]

No description provided.

[ruairif]

1 minor change to the logic for validating the input but otherwise it looks good; clear, well commented and documented

👍

[vshlapakov]

I can only ask for the same minor change mentioned by Ruairi, feel free to add tests. Well done 👍

[rafaelcapucho]

Hello guys @vshlapakov @ruairif ,
The PR is updated, with the suggested changes and the test cases, thx.

[codecov]

Codecov Report

Merging #125 into master will decrease coverage by 0.02%.
The diff coverage is 91.66%.

@@            Coverage Diff             @@
##           master     #125      +/-   ##
==========================================
- Coverage   93.61%   93.59%   -0.03%     
==========================================
  Files          28       28              
  Lines        1895     1919      +24     
==========================================
+ Hits         1774     1796      +22     
- Misses        121      123       +2

Impacted Files	Coverage Δ
scrapinghub/client/exceptions.py	81.53% <66.66%> (-0.72%)	⬇️
scrapinghub/client/jobs.py	85.71% <95.23%> (+1.68%)	⬆️

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