Support template literals

[CodeFoodPixels]

When I'm writing code for Node nowadays I tend to use template literals instead of normal string literals, even if the string doesn't need the templating ability. It'd be awesome if this extension could offer the autocomplete palette when I type a backtick (`).

I tried updating the JS for the extension within the extensions folder on my machine and couldn't get it to work. Happy to make the change myself and send a PR if you could offer some guidance.

[DimitarNestorov]

I just tried adding ` in triggers on extesnion.ts:9
Not sure, but microsoft/vscode#25034 seems to be related