Update index.md
Update index.md

Update docs to include async / await example
boneskull/mocha,boneskull/mocha,outsideris/mocha,mochajs/mocha,mochajs/mocha,hoverduck/mocha,adamgruber/mocha,outsideris/mocha,hoverduck/mocha,hoverduck/mocha,adamgruber/mocha,mochajs/mocha,adamgruber/mocha,boneskull/mocha,hoverduck/mocha,igwejk/mocha,igwejk/mocha