Fix README truncation

[mohsen1]

Completes the truncated sentence in README.md about multiple config files being a fatal error. Fixes #7

[greptile-apps]

Greptile Summary

This PR addresses a documentation issue by completing a truncated sentence in the README.md file and synchronizing version numbers across the workspace. The main change fixes line 129 in README.md, completing the incomplete sentence "If multiple files" to "If multiple files are found in the same directory, it's a fatal error." This provides crucial information about the library's behavior when multiple configuration files exist in the same directory.

Additionally, the PR updates version numbers in both example Cargo.toml files (basic and advanced examples) from 0.2.0 to 0.5.0 to align with the main library version. This version synchronization is a standard practice in Rust workspaces to maintain consistency across all members during release cycles.

The changes integrate well with the existing codebase structure, where the main clap-config-file library provides procedural macros for adding configuration file support to clap-based CLI applications. The README fix ensures users have complete information about error handling behavior, while the version alignment maintains workspace consistency without affecting functionality.

Confidence score: 5/5

• This PR is extremely safe to merge with no risk of breaking functionality
• Score reflects simple documentation fixes and version alignment changes with zero functional impact
• No files require special attention as all changes are cosmetic or documentation-related

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