fix: invalid year range error

[ekkolon]

Closes #22

📑 Description

Previously, attempts to utilize commands with the --year flag or parsing the .licensarc configuration file would result in errors due to mishandling of the YYYY-present format for license years.

Changes Made:

• Resolved the issue where errors occurred during the execution of CLI commands utilizing the --year flag.
• Fixed parsing errors encountered when reading license year periods from the .licensarc configuration file.
• Added custom LicenseYearError enum

Fixes:

• CLI commands now properly handle the --year flag, ensuring correct (de)serialization and parsing of license years.
• Parsing of license year periods from the .licensarc configuration file has been rectified, preventing errors and ensuring accurate interpretation of YYYY-present format.

✅ Checks

• My pull request adheres to the code style of this project
• My code requires changes to the documentation
• I have updated the documentation as required
• All the tests have passed

ℹ Additional Information