Numeric ID validation

What's new

• New input: validate-id-format — supports "numeric" format to reject non-digit IDs (e.g. 281782l), preventing bad data from entering the database
• Added Semver GitHub Action
• Updated README with semver usage

Full Changelog: 1.0.1...1.0.2

Perf improvement

• Avoid sorting
• Don't return the same duplicate twice

Validate or find duplicates in a CSV

1.0.0

Add find-duplicates input