Merge pull request #3 from Ryu0118/deprecate-swift-5.8

Deprecate Swift 5.8

Package.swift

@@ -5,22 +5,47 @@ import PackageDescription
 
 let package = Package(
     name: "CoWBox",
+    platforms: [
+      .iOS(.v13),
+      .macOS(.v10_15),
+      .tvOS(.v13),
+      .watchOS(.v6),
+    ],
     products: [
         // Products define the executables and libraries a package produces, making them visible to other packages.
         .library(
             name: "CoWBox",
             targets: ["CoWBox"]
         ),
+        .library(
+            name: "ObservedCoWBox",
+            targets: [
+                "ObservedCoWBox"
+            ]
+        )
+    ],
+    dependencies: [
+        .package(url: "https://github.com/pointfreeco/swift-perception", from: "1.1.7"),
     ],
     targets: [
         // Targets are the basic building blocks of a package, defining a module or a test suite.
         // Targets can depend on other targets in this package and products from dependencies.
         .target(
             name: "CoWBox"
         ),
+        .target(
+            name: "ObservedCoWBox",
+            dependencies: [
+                .product(name: "Perception", package: "swift-perception")
+            ]
+        ),
         .testTarget(
             name: "CoWBoxTests",
             dependencies: ["CoWBox"]
         ),
+        .testTarget(
+            name: "ObservedCoWBoxTests",
+            dependencies: ["ObservedCoWBox"]
+        ),
     ]
 )