Update bitstream-io requirement from 1.1 to 2.2

[dependabot[bot]]

Updates the requirements on bitstream-io to permit the latest version.

Commits

• 1e54cf9 Bump version to 2.2.0
• 160db28 Simplify docs to use new read_as interface
• 97848f7 Add read_as_to and write_as_from to BitRead and BitWrite traits
• 527f1a3 Add corresponding write_as to ByteWrite trait
• 56929ed Add ByteReader option to use specified endianness
• 020d8e8 Bump version to 2.0.0
• f48a78c Merge pull request #17 from fengalin/impl-debug
• f6adcba Derive Debug for some types so they can be used in Debug derived structs.
• b0d8304 Add .gitignore
• 21ba869 Merge pull request #16 from fengalin/from_reader-lt-constrained-context
• Additional commits viewable in compare view

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