Regression in 1.0.7: double quotes not allowed in attribute value

[HugoMuller]

Hi,

I think there might be a regression in Volar 1.0.7. This used to work before:

<template>
  <input type="text" placeholder='Example: "something"'>
</template>

Since 1.0.7 it produces the following errors:

No value exists in scope for the shorthand property 'something'. Either declare one or provide an initializer. ts(18004)
')' expected. ts(1005)

So now I cannot use double quotes in my attributes anymore.