Fix cloudpickle - dill error

[yannikschaelte]

Remove dill dependency. Fixes #365

[codecov-io]

Codecov Report

Merging #367 (cd54e10) into develop (70e6696) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #367      +/-   ##
===========================================
+ Coverage    83.60%   83.64%   +0.03%     
===========================================
  Files           87       87              
  Lines         5020     5026       +6     
===========================================
+ Hits          4197     4204       +7     
+ Misses         823      822       -1     

Impacted Files	Coverage Δ
pyabc/sampler/mapping.py	97.50% <100.00%> (+2.62%)	⬆️
pyabc/sampler/singlecore.py	100.00% <0.00%> (ø)
pyabc/weighted_statistics.py	91.22% <0.00%> (ø)
pyabc/inference/util.py	98.00% <0.00%> (+0.02%)	⬆️
pyabc/sampler/multicore.py	98.24% <0.00%> (+0.03%)	⬆️
pyabc/sampler/multicorebase.py	97.61% <0.00%> (+0.05%)	⬆️
pyabc/sampler/eps_mixin.py	92.20% <0.00%> (+0.10%)	⬆️

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