Increase coverage and lint `SingleTableMetadata`

[pvk-developer]

[codecov-commenter]

Codecov Report

Merging #926 (e9e0f06) into V1.0.0.dev (38dca14) will increase coverage by 0.03%. The diff coverage is n/a.

@@              Coverage Diff               @@
##           V1.0.0.dev     #926      +/-   ##
==============================================
+ Coverage       70.70%   70.73%   +0.03%     
==============================================
  Files              39       39              
  Lines            3072     3069       -3     
==============================================
- Hits             2172     2171       -1     
+ Misses            900      898       -2     

Impacted Files	Coverage Δ
sdv/metadata/single_table.py	100.00% <ø> (+1.29%)	:arrow_up:

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