Improve Union-type Determism

[seandstewart]

• Add intelligent instance-checks for unions (resolves #167)
• Make field.default positional (resolves #168)
• Add __version__ to typic.__init__ and add bumpver to manage multiple versions (resolves #168)

[codecov[bot]]

Codecov Report

Merging #169 (b14008f) into main (f06f427) will decrease coverage by 0.01%. The diff coverage is 80.00%.

@@            Coverage Diff             @@
##             main     #169      +/-   ##
==========================================
- Coverage   94.86%   94.84%   -0.02%     
==========================================
  Files          37       37              
  Lines        4053     4058       +5     
  Branches      556      558       +2     
==========================================
+ Hits         3845     3849       +4     
  Misses        130      130              
- Partials       78       79       +1     

Flag	Coverage Δ
unittests	94.72% <80.00%> (-0.02%)	:arrow_down:

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Impacted Files	Coverage Δ
typic/klass.py	100.00% <ø> (ø)
typic/serde/des.py	92.43% <75.00%> (-0.17%)	:arrow_down:
typic/__init__.py	100.00% <100.00%> (ø)

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