Release 0.2.1

- Improve internal implementation of arguments.
- Accept and pass through `mut` before argument names.
- Add an example for a simplified serde-like use case.
- Add a note for the limitation related to lifetimes.

Release 0.2.0

- Macro call convention has changed. This is a breaking change.
  - Default specialization now needs to be marked `default` explicitly.
  - As such use of generic args doesn't imply default specialization any
    more. However, generic args support is very rudimentary for now.
  - Arguments need to be stated after specializations.
- Arguments... arguments?! Passing multiple arguments from callsite to
  the specialization is supported now. Note that the specialization
  still happens based on the first argument only.
- Documentation and general code health improvements.

Release 0.1.2

- Improve documentation.
- Add trait bound example.
- Minor stylistic changes.

Release 0.1.1

- Added missing MIT LICENSE file.
- Added some badges to README.md.