Updated the package.swift file

Package.swift

@@ -5,24 +5,15 @@ import PackageDescription
 
 let package = Package(
     name: "PartitionKit",
+    platforms: [.iOS(.v13), .macOS(.v10_15), .watchOS(.v6)],
     products: [
-        // Products define the executables and libraries produced by a package, and make them visible to other packages.
         .library(
             name: "PartitionKit",
             targets: ["PartitionKit"]),
     ],
-    dependencies: [
-        // Dependencies declare other packages that this package depends on.
-        // .package(url: /* package url */, from: "1.0.0"),
-    ],
     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 which this package depends on.
         .target(
             name: "PartitionKit",
             dependencies: []),
-        .testTarget(
-            name: "PartitionKitTests",
-            dependencies: ["PartitionKit"]),
     ]
 )