crates.io release 0.1.3

* Update `base64` to 0.13.0.

crates.io release 0.1.2

* Implemented `From<&'static Encoding>` for `Charset`.
* Added optional Serde support.

crates.io release 0.1.1

* Added `decode_ascii()`.
* Added `decode_latin1()`.

crates.io release 0.1.0

* Initial release.