feat: added uncertainty wts property

[kjappelbaum]

closes #39

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation

Actions (for code changes)

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[kjappelbaum]

Codecov Report

Merging #42 into master will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #42      +/-   ##
==========================================
+ Coverage   96.84%   96.89%   +0.04%     
==========================================
  Files          10       10              
  Lines         603      612       +9     
==========================================
+ Hits          584      593       +9     
  Misses         19       19              

Flag	Coverage Δ
#unittests	96.89% <100.00%> (+0.04%)	⬆️

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Impacted Files	Coverage Δ
pypal/pal/core.py	100.00% <100.00%> (ø)
pypal/pal/pal_base.py	96.50% <100.00%> (+0.07%)	⬆️

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