Erdantic

- Removed support for Python 3.6. ([Issue 51](https://github.com/drivendataorg/erdantic/issues/51), [PR #56](https://github.com/drivendataorg/erdantic/pull/56))
- Added support for modules as inputs to all entrypoints to diagram creation (`create`, `draw`, `to_dot`, CLI). For all modules passed, erdantic will find all supported data model classes in each module. ([Issue 23](https://github.com/drivendataorg/erdantic/issues/23), [PR #58](https://github.com/drivendataorg/erdantic/pull/58))
- Added new parameter `limit_search_models_to` to all entrypoints to allow for limiting which data model classes will be yielded from searching a module.

- Fixed error when rendering a data model that has field using `typing.Literal`. ([PR 49](https://github.com/drivendataorg/erdantic/pull/49))

- Added support for showing field documentation from Pydantic models with descriptions set with `Field(description=...)` in SVG tooltips. This will add an "Attributes" section to the tooltip using Google-style docstring format and lists fields where the `description` keyword argument is used. ([Issue 8](https://github.com/drivendataorg/erdantic/issues/8#issuecomment-958905131), [PR 42](https://github.com/drivendataorg/erdantic/pull/42))

- Fixed handling of forward references in field type declarations. Evaluated forward references will be properly identified. Forward references not converted to `typing.ForwardRef` will throw a `StringForwardRefError` with instructions for how to resolve. Unevaluated forward references will throw an `UnevaluatedForwardRefError` with instructions for how to resolve. See [new documentation](https://erdantic.drivendata.org/stable/forward-references/) for more details. ([Issue #40](https://github.com/drivendataorg/erdantic/issues/40), [PR #41](https://github.com/drivendataorg/erdantic/pull/41))
- Changed name of `erdantic.errors` module to `erdantic.exceptions`. ([PR 41](https://github.com/drivendataorg/erdantic/issues/41))
- Added new `ErdanticException` base class from which other exceptions raised within the erdantic library are subclassed from. Changed several existing `ValueError` exceptions to new exception classes that subclass both `ErdanticException` and `ValueError`. ([PR 41](https://github.com/drivendataorg/erdantic/issues/41))
- Changed `__lt__` method on `Model` and `Edge` to return `NotImplemented` instead of raising an exception to follow typical convention for unsupported input types. ([PR 41](https://github.com/drivendataorg/erdantic/issues/41))

- Fixed runtime error when rendering a data model that had a field containing `typing.Any`. ([Issue 25](https://github.com/drivendataorg/erdantic/issues/25), [PR #26](https://github.com/drivendataorg/erdantic/issues/26))

- Added option to specify models as terminal nodes. This allows you to truncate large diagrams and split them up into smaller ones. ([PR 24](https://github.com/drivendataorg/erdantic/pull/24))