Identifiers before tagged template literals should be marked as functions

Example code:

``` js
foo();
foo`bar`;
```

Rendered with Atom 1.11.2, language-javascript 0.119.0:

![](https://i.gyazo.com/5412858098cb7a22b9419a5834b79c5a.png)

Expected behavior: The identifier `foo` before the template literal should be marked as a function (and colored blue with this theme), because `foo` gets called as a function when it is used as a template literal tag.
