Syntax highlighting fails for event handlers with colons in the event name.

[andrewsm80]

• I have searched through existing issues
• I have read through docs
• I have read FAQ
• I have tried restarting VS Code or running Vetur: Restart VLS

Info

• Platform: Windows 10
• Vetur version: v0.36.0
• VS Code version: v1.71.0

Problem

Syntax highlighting fails for event handlers with colons in the event name.

For example, if I have a component <my-component> that emits an event as such: this.$emit("update:someValue", someValue),
then syntax highlighting will fail when I attach event handlers to <my-component> from the parent component.

Event names in the form "update:propName" are recommended by the Vue docs for events that update props, so this pattern should also be supported by Vetur.

Reproducible Case

1. Open a new tab in VSCode.
2. Change language mode to Vue.
3. Paste the following into the editor

<template>
  <my-component 
    v-on:update:someValue="value => foo.bar.setValue(baz, value)"
    v-on:updateSomeValue="value => foo.bar.setValue(baz, value)"
  ></my-component>
</template>