bump version to v0.1.2

[SF-Zhou]

1. add dry_run option

[Copilot]

Pull request overview

This PR adds a dry_run option to the blkreader library and CLI tool, allowing users to validate extent mapping and file structure without performing actual I/O operations. The version is bumped from v0.1.1 to v0.1.2.

Changes:

• Added dry_run field to Options struct with corresponding builder method
• Implemented dry_run mode in reader logic to skip actual I/O operations
• Added --dry-run CLI flag to the blkreader binary
• Updated documentation to describe the new feature

Reviewed changes

Copilot reviewed 4 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
Cargo.toml	Bumped version from 0.1.1 to 0.1.2
Cargo.lock	Updated version lock to 0.1.2
src/options.rs	Added dry_run field, default value, and builder method with documentation
src/reader.rs	Implemented dry_run logic in fallback_read and DeviceHandle::read_at methods, added test for options builder
src/bin/blkreader.rs	Added --dry-run CLI argument and wired it to Options
README.md	Documented the --dry-run option and its use cases

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[Copilot]

Pull request overview

Copilot reviewed 4 out of 6 changed files in this pull request and generated 3 comments.

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