Update EIP Template: Add EIP patent waiver

[Pandapip1]

Obviously IANAL.

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[eth-bot]

Hi! I'm a bot, and I wanted to automerge your PR, but couldn't because of the following issue(s):

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(fail) eip-template.md

classification
ambiguous

• 'eip-template.md' must be in eip-###.md format; this error will be overwritten upon relevant editor approval

[xinbenlv]

Unapprove. Sorry didn't realize this is being added to the template.

[xinbenlv]

Unapprove. Sorry I thought this was an individual EIP but realize it's a template. Let's wait for consensus.

Personally, I vote against having a patent waiver clause in the template.

[github-actions]

There has been no activity on this pull request for 2 weeks. It will be closed after 3 months of inactivity. If you would like to move this PR forward, please respond to any outstanding feedback or add a comment indicating that you have addressed all required feedback and are ready for a review.