Document the default execution of "*.coffee" files
Document the default execution of "*.coffee" files

See https://github.com/mochajs/mocha/blob/221a3c049ed3a943ce36fd0a4ffe0e23acbb7cab/bin/_mocha#L155
boneskull/mocha,adamgruber/mocha,adamgruber/mocha,hoverduck/mocha,adamgruber/mocha,hoverduck/mocha,outsideris/mocha,boneskull/mocha,outsideris/mocha,mochajs/mocha,hoverduck/mocha,igwejk/mocha,mochajs/mocha,hoverduck/mocha,mochajs/mocha,boneskull/mocha,igwejk/mocha