Added #

• Initial functionality to update the version in the pubspec.yaml file.
• Support for version changes at major, minor, and patch levels.
• Error handling if the pubspec.yaml file is not found or if the version is not defined.
• Command-line functionality to execute version updates.

Notes #

• Ensure that the pubspec.yaml file has the correct format (e.g., version: 1.0.0+1) for the functionality to work properly.
• Recommended to add +1 to the version if you receive the error "version not found in pubspec.yaml".