Update License

[oleibman]

Someone opened a PR to do this a few days ago. I posted a comment. When I was ready to return to the ticket, I couldn't find it as opened or closed. It seemed like a reasonable idea. I will submit this PR for now and sit on it for about a week to give the original author a chance to resubmit.

This is:

• a bugfix
• a new feature
• refactoring
• additional unit tests
• update license

Checklist:

• Changes are covered by unit tests
  • Changes are covered by existing unit tests
  • New unit tests have been added
• Code style is respected
• Commit message explains why the change is made (see https://github.com/erlang/otp/wiki/Writing-good-commit-messages)
• CHANGELOG.md contains a short summary of the change and a link to the pull request if applicable
• Documentation is updated as necessary

Why this change is needed?

Provide an explanation of why this change is needed, with links to any Issues (if appropriate).
If this is a bugfix or a new feature, and there are no existing Issues, then please also create an issue that will make it easier to track progress with this PR.