Changelog:
============
-Drop Python3.7 support
-Drop Python 3.7, and PyPy 3.7 and 3.8
-Use positional-only self in BaseModel constructor, so no field name can ever
conflict with it
-Make @validate_call return a function instead of a custom descriptor - fixes
binding issue with inheritance and adds self/cls argument to validation errors
-Exclude BaseModel docstring from JSON schema description
-Introducing classproperty decorator for model_computed_fields
-Explicitly raise an error if field names clashes with types
-Use stricter serializer for unions of simple types
Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
