docs(readme): update link for ISO 639-1 standard

[FajarKim]

Description

Update link for ISO 639-1 standard

Type of change

• Bug fix (added a non-breaking change which fixes an issue)
• New feature (added a non-breaking change which adds functionality)
• Updated documentation (updated the readme, templates, or other repo files)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• I have checked to make sure no other pull requests are open for this issue
• The code is properly formatted and is consistent with the existing code style
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

Screenshots

No screenshots

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Name	Status	Preview	Updated (UTC)
github-readme-profile	✅ Ready (Inspect)	Visit Preview	Oct 27, 2023 4:13am