remove hypothesis (at least for now)

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oops #586

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01 🎉

Comparison is base (9151592) 99.04% compared to head (c555bfb) 99.05%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #583      +/-   ##
==========================================
+ Coverage   99.04%   99.05%   +0.01%     
==========================================
  Files          44       45       +1     
  Lines        3887     3935      +48     
  Branches      520      523       +3     
==========================================
+ Hits         3850     3898      +48     
  Misses         23       23              
  Partials       14       14              

Impacted Files	Coverage Δ
src/klein/test/__init__.py	100.00% <ø> (ø)
src/klein/test/not_hypothesis.py	100.00% <100.00%> (ø)
src/klein/test/test_headers.py	100.00% <100.00%> (ø)
src/klein/test/test_message.py	100.00% <100.00%> (ø)
src/klein/test/test_plating.py	100.00% <100.00%> (ø)
src/klein/test/test_request_compat.py	100.00% <100.00%> (ø)

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Worth noting that this cuts time spent in CI in half without affecting coverage.