Update bitstream-io requirement from 1.2.0 to 2.0.0 (#53)

Updates the requirements on [bitstream-io](https://github.com/tuffy/bitstream-io) to permit the latest version.
- [Commits](tuffy/bitstream-io@v1.2.0...v2.0.0)

---
updated-dependencies:
- dependency-name: bitstream-io
  dependency-type: direct:production
...

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Cargo.toml

@@ -22,7 +22,7 @@ pedantic = "warn"
 
 [dependencies]
 arithmetic-coding-core = { path = "./arithmetic-coding-core", version = "0.3.0" }
-bitstream-io = "1.2.0"
+bitstream-io = "2.0.0"
 thiserror = { workspace = true }
 
 [dev-dependencies]