V1.5(Changed the way to use RichText)

[NuPlay]

I have changed the way to use RichText.

In this change, I have tried to make the library fit SwiftUI grammar more.

Previous

RichText(html: html, lineHeight: 170, imageRadius: 0, fontType: .default, colorScheme: .automatic, colorImportant: false)
            .placeholder {
                 Text("loading")
            }

After

RichText(html: html)
            .lineHeight(170)
            .imageRadius(12)
            .fontType(.default)
            .colorScheme(.automatic)
            .colorImportant(true)
            .linkOpenType(.SFSafariView)
            .placeholder {
                 Text("loading")
            }

I think that this change is more convenient to use, but please let me know if you have any other opinions.