fix: add support for Mercosul motorcycle license plates

[Henrique-volponi]

fix: support motorcycle plates in mercosul validation

The mercosulRegex was only validating car plates (e.g. ABC1D23),
rejecting valid motorcycle plates (e.g. ABC12D3). This fix updates
the regex to cover both formats.

Supported formats

Type	Example	Pattern
Car	ABC1D23	[a-z]{3}[0-9]{1}[a-z]{1}[0-9]{2}
Motorcycle	ABC12D3	[a-z]{3}[0-9]{2}[a-z]{1}[0-9]{1}

Changes

• Updated mercosulRegex in is-valid-license-plate.ts to match both patterns
• Added test cases for motorcycle plates in is-valid-license-plate.test.ts

No breaking changes. Existing car plate validation remains unaffected.

[hyanmandian]

@Henrique-volponi thanks! just fix the tests please!!

[Henrique-volponi]

Done! I've fixed the formatting issues (tabs vs spaces) and cleaned up the test comments. The CI should pass now. Thanks!

[hyanmandian]

Thanks for the contribution @Henrique-volponi ! I already published 2.0.1 with this change and added you in our contributor list! Let me know if its now working as expected 🤞