Invalid link to the license in the readme.md

[Razushi]

Font Name (Geist Sans/Geist Mono):

• [x] Geist Sans
• [x] Geist Mono

Description of the Issue: The link to the license in the readme.md contains a typo and sends you to ~geist-font/blob/main/LICENSE.TXT

Steps to Reproduce:

1. Click on the link in the header License in the readme file.

Expected Behavior: The link should correctly send user to ~geist-font/blob/main/LICENSE.txt

Screenshots: If applicable, add screenshots to help explain your problem.

Environment (please complete the following information):

• OS: Any
• Software: Browser
• Version of the Font: N/A

Additional Context: Add any other context about the problem here.

[JohnPhamous]

Fixed!