ContactInfo, Contact and PhoneNumber models

[JaviCerveraIngram]

A Tier contains a contact_info field which is deserialized as a dictionary. Would it make more sense to deserialize it into its own model?

[codecov-io]

Codecov Report

Merging #18 into master will increase coverage by 1.15%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #18      +/-   ##
==========================================
+ Coverage   82.59%   83.75%   +1.15%     
==========================================
  Files          23       24       +1     
  Lines         477      511      +34     
==========================================
+ Hits          394      428      +34     
  Misses         83       83

Impacted Files	Coverage Δ
connect/models/tiers.py	100% <100%> (ø)	⬆️
connect/models/contact.py	100% <100%> (ø)

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[JaviCerveraIngram]

BTW, I have assumed that the properties of these models have not changed since R14, and I have taken the same properties that the PHP SDK uses. Please verify that these are correct for R15 (I have to double check, but I think the properties of some of the other models were not the same in the Python SDK as in the PHP SDK, which I assumed was due to changes in R15?).