* [wackbyte](https://github.com/wackbyte) added `#[qualifiers]` attribute which unifies all kinds of items to which qualifiers can be applied.
* [wackbyte](https://github.com/wackbyte) added `#[field_qualifiers]` attribute which applies qualifiers to all fields of the item.
* [JohnScience](https://github.com/JohnScience) added a default feature `legacy_attrs` to allow the use of the legacy `#[fn_qualifiers]`, `#[mod_qualifiers]`, `#[named_field_qualifiers]`, and `#[struct_qualifiers]` attributes.
* [JohnScience](https://github.com/JohnScience) started a changelog.
* Added a note on legacy attributes to the README.
* Fixed the warning about the unused `legacy` module.