Rename AUTHORS to AUTHORS

[danialzivehdadr]

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Checklist

• [√] Make sure to open an issue as a bug/issue before writing your code! That way we can discuss the change, evaluate designs, and agree on the general idea
• [√] Ensure the tests and linter pass
• [√] Code coverage does not decrease
• [√] Appropriate docs were updated
• [√] Appropriate comments were added, particularly in complex areas or places that require background
• [√] No new warnings or issues will be generated from this change

Fixes #issue_number_goes_here 🦕

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