source tags with the type property set create an invalid AMP page

[me4502]

I'm using gatsby-plugin-html2amp, and am encountering an issue where Gatsby adds a type="image/webp to the WebP <source> tags.

type is not a valid field for amp-img, so therefore should be removed.

[t-jindai]

@me4502 Sorry for my late reply 🙇 I fixed this issue at v1.3.1