Allow __init__(cookies=None). Fixes #345

[evgkirov]

No description provided.

[codecov-io]

Codecov Report

Merging #346 into master will decrease coverage by 0.04%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #346      +/-   ##
==========================================
- Coverage   40.57%   40.52%   -0.05%     
==========================================
  Files           9        9              
  Lines         944      945       +1     
  Branches      130      130              
==========================================
  Hits          383      383              
- Misses        553      554       +1     
  Partials        8        8

Impacted Files	Coverage Δ
fut/core.py	26.96% <0%> (-0.05%)	⬇️

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