Cast int cookie dict max_age

[andruten]

May fix #161

[codecov]

Codecov Report

Attention: Patch coverage is 40.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 97.84%. Comparing base (e7ad0c2) to head (1d80f40).

Files with missing lines	Patch %	Lines
revproxy/utils.py	40.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #185      +/-   ##
==========================================
- Coverage   98.55%   97.84%   -0.71%     
==========================================
  Files           7        7              
  Lines         414      418       +4     
  Branches       70       70              
==========================================
+ Hits          408      409       +1     
- Misses          3        6       +3     
  Partials        3        3              

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[dfourie]

Hi there, I did encounter that bug as well, this branch fixes it.