Change to MPL-2.0 License
Change to MPL-2.0 License

Closes #17

Permission to relicense obtained from prior contributors, see
  https://github.com/mozilla/github-org-scripts/issues/17

fwenzel/github-org-scripts,fwenzel/github-org-scripts,hwine/github-org-scripts,mozilla/github-org-scripts,mozilla/github-org-scripts,mozilla/github-org-scripts,hwine/github-org-scripts