Adds binding to FHIRClassProperty

[bwalsh]

This PR:

• Adds binding to FHIRClassProperty - useful for downstream rendering

[codecov-commenter]

Codecov Report

Base: 99.21% // Head: 99.24% // Increases project coverage by +0.02% 🎉

Coverage data is based on head (8b9b19b) compared to base (bcef8e7).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master       #4      +/-   ##
==========================================
+ Coverage   99.21%   99.24%   +0.02%     
==========================================
  Files           5        5              
  Lines         127      132       +5     
==========================================
+ Hits          126      131       +5     
  Misses          1        1              

Impacted Files	Coverage Δ
tests/test_fhirspec.py	100.00% <100.00%> (ø)

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[nazrulworld]

Thanks a lot, please update https://github.com/nazrulworld/fhirspec/blob/master/AUTHORS.rst here.