support passing pydantic original model as request body

[lust4life]

Changes proposed in this pull request:

• support passing pydantic original model as request body

from pydantic import BaseModel
from uplink import Consumer, Body

class CreateRepo(BaseModel):
   name: str
   delete_branch_on_merge: bool = False

class GitHub(Consumer):
   @post("user/repos")
   def create_repo(self, repo: Body(type=CreateRepo)):
      """Creates a new repository for the authenticated user."""


github = GitHub(base_url="https://api.github.com")
repo = CreateRepo(name="my_favorite_new_project")
github.create_repo(repo)  # instead of github.create_repo(repo.dict())

Attention: @prkumar

[codecov]

Codecov Report

Merging #209 (44d7dcc) into master (0a4c072) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #209   +/-   ##
=======================================
  Coverage   99.91%   99.91%           
=======================================
  Files          44       44           
  Lines        2399     2401    +2     
  Branches      179      180    +1     
=======================================
+ Hits         2397     2399    +2     
  Misses          2        2           

Impacted Files	Coverage Δ
uplink/converters/pydantic_.py	100.00% <100.00%> (ø)

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