Bug not able to parse style attribute with rgba function

[mrgodhani]

Describe the bug
vue-safe-html does not parse style attribute that has rgba function in css. Even though style attribute is allowed.

To Reproduce
Steps to reproduce the behavior:

1. Add to allowedTags
2. Add style to allowedAttributes
3. Try to parse "Text" with vue-safe-html
4. Notice whole text would be removed instead as it is not able to handle rgba function in style.Expected behavior
5. Try to parse "Text" with vue-safe-html. Notice this would work fine.

If and <style> is allowed it should work as expected.