Quote shifting to backticks

[Madd0g]

Javascript recently gained support of template strings, and now supports three types of strings:

'single'
"double"
`backtick`

Since I've gotten used to shifting quotes with single/double and now find myself using backticks with JS a lot, I thought I would suggest adding a 3rd style.

I don't know if it's possible to save plugin settings somehow or only do this with JS documents, but it would be nice to be able to configure this.

Thanks