Merge pull request #17 from mtonosaki/Color-iOS14

Color only supported iOS14

Author: mtonosaki

Sources/Tono/Color.swift

@@ -7,7 +7,7 @@
 
 import SwiftUI
 
-@available(macOS 11.0, *)
+@available(macOS 11.0, iOS 14.0, *)
 public extension Color {
     init(sharpAndHexString: String) {
         let start = sharpAndHexString.index(