STYLE: Apply black formatting

[ANazaret]

Justified by psf/black#134

[gabmis]

Well, if we're gonna do it might as well do it right

[codecov-io]

Codecov Report

Merging #428 into master will increase coverage by 0.02%.
The diff coverage is 92.1%.

@@            Coverage Diff             @@
##           master     #428      +/-   ##
==========================================
+ Coverage    88.7%   88.73%   +0.02%     
==========================================
  Files          29       29              
  Lines        3372     3372              
==========================================
+ Hits         2991     2992       +1     
+ Misses        381      380       -1

Impacted Files	Coverage Δ
scvi/dataset/anndataset.py	84.44% <ø> (ø)	⬆️
scvi/dataset/synthetic.py	100% <100%> (ø)	⬆️
scvi/dataset/seqfish.py	100% <100%> (ø)	⬆️
scvi/models/modules.py	95.68% <100%> (ø)	⬆️
scvi/models/log_likelihood.py	100% <100%> (ø)	⬆️
scvi/inference/inference.py	100% <100%> (ø)	⬆️
scvi/dataset/brain_large.py	97.82% <100%> (ø)	⬆️
scvi/models/vaec.py	100% <100%> (ø)	⬆️
scvi/models/utils.py	96% <100%> (ø)	⬆️
scvi/dataset/cite_seq.py	97.22% <50%> (ø)	⬆️
... and 6 more

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