Added visionOS support to package @ 5.9 (#274)

Author: bsneed

Package@swift-5.9.swift

@@ -0,0 +1,38 @@
+// swift-tools-version:5.9
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "Segment",
+    platforms: [
+        .macOS("10.15"),
+        .iOS("13.0"),
+        .tvOS("11.0"),
+        .watchOS("7.1"),
+        .visionOS("1.0")
+    ],
+    products: [
+        // Products define the executables and libraries a package produces, and make them visible to other packages.
+        .library(
+            name: "Segment",
+            targets: ["Segment"]),
+    ],
+    dependencies: [
+        // Dependencies declare other packages that this package depends on.
+        // .package(url: /* package url */, from: "1.0.0"),
+        .package(url: "https://github.com/segmentio/sovran-swift.git", from: "1.1.0")
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
+        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        .target(
+            name: "Segment",
+            dependencies: [
+                .product(name: "Sovran", package: "sovran-swift")
+            ]),
+        .testTarget(
+            name: "Segment-Tests",
+            dependencies: ["Segment"]),
+    ]
+)