Allow .finally() on Promises

Nathan Friendrequested to merge
nfriend-allow-promise-finally into master

This MR modifies the promise/catch-or-return rule to allow .finally() blocks to be attached to Promises.

The Promise.finally() method is included in the latest ECMAScript draft: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/finally#Specifications.

This MR also adds a .prettierrc file and beautifies index.js using these rules. The .prettierrc is a simplified version of GitLab CE's .prettierrc: https://gitlab.com/gitlab-org/gitlab-ce/blob/master/.prettierrc.

Edited by Nathan Friend

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