Added Video (info) edit function

[TentacleSama4254]

update() Simmilar` to the upload function, but insted of file Path the link to video is required.
Will throw error if video isn't owned by signed in account.

import {update} from 'youtube-videos-uploader' 
//or
const {update} = require ('youtube-videos-uploader') 

TO DO

• fix error appearing at save sometimes
• fix publishType error (public/private/unlisted)
• better error handling
• fix browser going to YouTube upload page before navigating to video
• add example to readme
• test if everything works

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This change is 

[fawazahmed0]

It was little harder to review the changes, because you have also formatted the code in this PR, other than that things are working great.
Thanks for this PR