Update package version to Swift 6.1

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version: 5.9
+// swift-tools-version: 6.1
 import PackageDescription
 
 let package = Package(

README.md

@@ -164,12 +164,7 @@ Each `XMLNode` contains an array of `Child` values representing the different ki
 ## Building
 
 This project is a Swift Package Manager module that uses the
-[Skip](https://skip.dev) plugin to transpile Swift into Kotlin.
-
-Building the module requires that Skip be installed using
-[Homebrew](https://brew.sh) with `brew install skiptools/skip/skip`.
-This will also install the necessary build prerequisites:
-Kotlin, Gradle, and the Android build tools.
+[Skip](https://skip.dev) plugin to build the package for both iOS and Android.
 
 ## Testing
 

Sources/SkipXML/SkipXML.swift

@@ -281,7 +281,7 @@ public struct XMLNode : Hashable {
     }
 
     /// Options for configuring the `XMLParser`
-    public struct Options: OptionSet, Hashable {
+    public struct Options: OptionSet, Hashable, Sendable {
         public let rawValue: Int
 
         public static let resolveExternalEntities = Options(rawValue: 1 << 0)