update .gitignore to only ignore root mocha.js [ci skip]
update .gitignore to only ignore root mocha.js [ci skip]

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