complete syntax highlighting about vscode-reasonml

[jmmk]

Not sure if this fits here or is a separate issue, but it looks like multiline strings aren't supported. Here's a screenshot:

You can see that not only are the lines of the string not highlighted correctly, but anything immediately following the string is incorrectly highlighted as well (in the second example the ;, and in the third example the ; and |> String.uppercase)

@jmmk thanks for reporting this. I've fixed the bug in the string highlighting and pushed a new version to the marketplace.

[jmmk]

@freebroccolo looks great, thanks!