Prepare release 2.6.0 (#65)

Changelog:

### Added

### Changed

- Replace xz2 to liblzma
- Bump MRSV to 1.65
- Support for multistream bzip2 files by default (#62)

### Fixed

- Update bzip to 0.4.4
- Update bgzip to 0.3
- Update zstd 0.13

Add zstd send support

2.4.0

Basic zstd support

2.3.2

Bump bgzip to 0.2.0, remove dependency on failure crate

2.3.0

Added:

- Support Seek and Send and prepare for future extension (#37)

2.2.0

Changed

- Make gz compression optional too, matching behavior of other compression formats.

v2.1.1

Changed:

- Replace `GzDecoder` with `MultiGzDecoder` for gzip decompression.

2.1.0

Added

- `sniff` function to detect compression format, and add benchmarks for most methods (#25)
- More test on compression level conversion (#26)

2.0.1

- Implement Clone and Copy for pub enums
- Add a changelog

1.0.0

- Initial code import for sourmash repo and crate rename