Implemented update_many method in PydanticMixin

[i8enn]

Bump version included

[codecov-io]

Codecov Report

Merging #16 into master will increase coverage by 0.43%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #16      +/-   ##
==========================================
+ Coverage   87.23%   87.67%   +0.43%     
==========================================
  Files           2        2              
  Lines         141      146       +5     
  Branches       28       28              
==========================================
+ Hits          123      128       +5     
  Misses          6        6              
  Partials       12       12

Impacted Files	Coverage Δ
pydantic_odm/mixins.py	87.14% <100%> (+0.47%)	⬆️

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