& and && should not be highlighted as an error

[thomas-darling]

I'm submitting a bug report

• Extension Version:
  1.0.3

Please tell us about your environment:

• Operating System:
  Windows 10

• Visual studio code version:
  1.32.3

Screenshot of incorrect highlight

Current behavior:

A single or double ampersand is highlighted as an error - despite being perfectly valid, and often used in binding expressions. See: https://html.spec.whatwg.org/#character-reference-state

I originally opened the bug here textmate/html.tmbundle#98, but it appears it is actually caused by this extension, as it does not occur when the extension is disabled.

Expected/desired behavior:

None of the ampersands shown here should be highlighted as errors.