Support for nested field types

[devinaconley]

• allow setting class type for serializable Nested field
• allow setting class type for nested serializable List
• will automatically use this class if _type is not specified in dictionary
• will throw error if conflicting _type is provided
• bump to 0.0.3

[codecov-io]

Codecov Report

Merging #3 into develop will decrease coverage by 0.76%.
The diff coverage is 95.08%.

@@             Coverage Diff             @@
##           develop       #3      +/-   ##
===========================================
- Coverage    99.31%   98.54%   -0.77%     
===========================================
  Files            7        7              
  Lines          290      344      +54     
===========================================
+ Hits           288      339      +51     
- Misses           2        5       +3

Impacted Files	Coverage Δ
objectfactory/__init__.py	100% <100%> (ø)	⬆️
test/test_fields.py	100% <100%> (ø)	⬆️
objectfactory/serializable.py	100% <100%> (ø)	⬆️
objectfactory/field.py	88.37% <84.21%> (-4.49%)	⬇️

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[devinaconley]

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