* fix: forward ref with nested models and optional fields
PR #1712 introduced a regression for forward refs in `ModelField.prepare`
as it would not return early for forward refs anymore.
Optional fields would hence have `required` set to `True`.
closes#1736
* test: skip python 3.6 as __future__.annotations is not defined
* starting validation_decorator
* correct skip_pre_38
* fix coverage and type hints
* mypy tests and move to class based decorator
* 3.6 fix, prevent duplicate github actions
* correct py 3.6 check
* better errors
* cleaner field names for args and kwargs
* add change and comments
* starting docs
* back to 3.7 for docs
* docs
* bump
* add async example and fix print indents
* allow type annotations as strings
* python 3.8 in docs
* rename Schema to Field
* add Schema function with deprecation warning
* mypy tests and other tweaks
* tweaks and cleanup
* Update pydantic/fields.py
Co-Authored-By: Sebastián Ramírez <tiangolo@gmail.com>
* new URL parsing, fix#603, fix#541
* AnyUrl parts and more tests
* more coverage and db DSNs
* remove DSN methods
* tests for urlstr
* remove debug
* make AnyStr a subtype of str
* fix with cython
* rearranging networking code
* allowing international domains, cleanup
* support international domains
* better URL builder
* allow underscores in subdomains and domains
* tests for json and schema, max length
* urlstr > stricturl
* updating docs
* tweak docs examples
* tweak docs
PrettyWood