Update LICENSE

[paolomainardi]

Summary

Updating the license using this format: https://spdx.org/licenses/MIT.html can fix the issue.

It closes #1002

[vercel]

@paolomainardi is attempting to deploy a commit to the Superagent Team on Vercel.

A member of the Team first needs to authorize it.

[greptile-apps]

PR Summary

The LICENSE file was updated to align with the standard MIT License format as specified by SPDX, resolving an issue with GitHub API recognition.

• Updated LICENSE file to match the standard MIT License format.
• Removed 'License' and 'MIT License' headers.
• Consolidated permission notice into a single paragraph.
• Ensured warranty disclaimer is included in the same paragraph.
• This update addresses Issue License is not found using the Github API #1002 regarding GitHub API license identification.

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