Unfix sphinx

[yannikschaelte]

fixes #449

[codecov-commenter]

Codecov Report

Merging #509 (08eb118) into develop (baf8c59) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #509      +/-   ##
===========================================
- Coverage    88.40%   88.38%   -0.02%     
===========================================
  Files          122      122              
  Lines         7337     7337              
===========================================
- Hits          6486     6485       -1     
- Misses         851      852       +1     

Impacted Files	Coverage Δ
pyabc/weighted_statistics.py	92.06% <0.00%> (-3.18%)	⬇️
pyabc/sampler/mapping.py	97.50% <0.00%> (+2.50%)	⬆️

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