Allow uploading array of files + Removed unnecessary code in index.js

Created by: TheVexatious

so many commits, ikr, its because it happens when i pull upstream (╯°□°）╯︵ ┻━┻ Anyway now you can upload an array of files like owo.upload(["img1.png", "img2.png"]) and will also work on one file if it is not in an array even.