android-sparse version 0.6.0

Changes:
    - Updated code to the Rust 2021 edition.
    - Made the implementation generic over `Read`/`Write` types, instead
      of limiting it to `File`s.

android-sparse version 0.5.0

Changes:
    - Complete architecture redesign. Readers and writers now produce
      and work on sparse blocks instead of a sparse file representation.
    - Drop the simg_dump command.
    - Significant performance improvements when writing Skip blocks and
      checking if a block is sparse.
    - Add unit and integration tests.
    - Disable unneeded Clap features.
    - Ensure writers's `finish` method is always invoked at the end, by
      implementing `Drop`.
    - Enable simg2img to decode multiple sparse images into a single raw
      image.

Changes:
    - Remove some unneeded public methods of File and Chunk.
    - Add docstrings.
    - Share file references via Rc<RefCell<File>> instead of cloning to
      avoid having too many open file handles.
    - Change project license to MIT only.

Changes:
    - simg_dump: Dump everything we know about the sparse file, even if
      there was an error during parsing.

Changes:
    - Add a new constants module that provides publically accessible
      constants of the sparse format.
    - Add the simg_dump util for displaying sparse file info.
    - The Reader now adds Crc32 chunks to the sparse file.
    - Add a README.md and license texts.
    - Switch to clap for command line argument parsing.
    - Hide CRC checksum calculation/checking of img2simg/simg2img
      behind a --crc flag.

Changes:
    - Major refactorings an API changes.
    - Fix sparse file block size to 4096 bytes.
    - Remove support for reading from generic Read implementers. Only
      reading from Files is supported now.
    - Instead of the add_{raw,fill,...} methods, a sparse File now only
      has a single add_chunk method. Merging of Chunks is now done by
      the Encoder instead of File.
    - Support for CRC writing by Writer and CRC checking by Reader.

Changes:
    - Pull TryFrom and TryInto from the standard library into this
      crate. This removes the dependency on the nightly compiler.

Initial release of android-sparse.

Supports reading and writing of sparse files, as well as encoding raw
files to sparse files and vice versa.
Also provides the CLI utils img2simg and simg2img for converting
between raw and sparse files.