Ensure jupyter_config.json is in sdist

[CasperWA]

Add culling kernels to jupyter config.

Fixes #190

[codecov]

Codecov Report

Merging #189 into develop will increase coverage by 0.32%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #189      +/-   ##
===========================================
+ Coverage    35.98%   36.31%   +0.32%     
===========================================
  Files           17       17              
  Lines         2137     2137              
===========================================
+ Hits           769      776       +7     
+ Misses        1368     1361       -7     

Flag	Coverage Δ
#optimade-client	36.31% <ø> (+0.32%)	⬆️

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Impacted Files	Coverage Δ
optimade_client/cli/run.py	100.00% <ø> (ø)
optimade_client/utils.py	61.60% <0.00%> (+2.16%)	⬆️

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