add .fossaignore [ci skip]
add .fossaignore [ci skip]

FOSSA thinks `CONTRIBUTING.md` is a license, which it is not.

adamgruber/mocha,hoverduck/mocha,boneskull/mocha,outsideris/mocha,outsideris/mocha,mochajs/mocha,igwejk/mocha,hoverduck/mocha,mochajs/mocha,adamgruber/mocha,boneskull/mocha,igwejk/mocha,hoverduck/mocha,hoverduck/mocha,boneskull/mocha,adamgruber/mocha,mochajs/mocha