Fix client cookie handling

[adwhit]

cc #101

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@178f5a1). Click here to learn what that means.
The diff coverage is 88.88%.

@@            Coverage Diff            @@
##             master     #111   +/-   ##
=========================================
  Coverage          ?   78.99%           
=========================================
  Files             ?       93           
  Lines             ?     9107           
  Branches          ?        0           
=========================================
  Hits              ?     7194           
  Misses            ?     1913           
  Partials          ?        0

Impacted Files	Coverage Δ
src/client/response.rs	60.86% <100%> (ø)
src/client/request.rs	78.14% <100%> (ø)
tests/test_client.rs	92.94% <82.6%> (ø)

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[fafhrd91]

Great! Thanks