Serialchemy

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* Fix license placement on setup.py

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* Add support for SQLAlchemy imperative (classical) mapping
* Drop support for Python versions bellow 3.8
* Drop support for SQLAlchemy 1.3

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* Fix to get model attribute name instead of table column name on polymorphic serializer
* Extends the PolymorphicModelSerializer to accept also column descriptors when searching
for the polymorphic column key.
* Add support for serialization of Python Enums
* Change PolymorphicModelSerializer to support inherited models of inherited models
* Change Field to use a default serializer for not None values
* Added support for sqlalchemy 1.4
* Add EnumKeySerializer

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* Add the composite fields to list of properties of model, to serialize that fields if it type is in EXTRA_SERIALIZERS.
* Fix error for SQLAlchemy composite attributes
* Added free functions dump and load so users can quickly dump a SQLAlchemy model without having to instancialize
ModelSerializer.

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* Fix: Error when deserializing of nested models when SQLAlchemy model primary
key attribute name differs from the column name
* Allow EXTRA_SERIALIZERS to be defined in runtime
* Check if a session was given when serializing/deserializing nested fields

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* First release on PyPI.