Updating package manifest to v6

Author: KyNorthstar

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version:5.1
+// swift-tools-version:6.0
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription
@@ -21,14 +21,15 @@ let package = Package(
     ],
     dependencies: [
         // Dependencies declare other packages that this package depends on.
-        .package(url: "https://github.com/RougeWare/Swift-MultiplicativeArithmetic.git", from: "1.4.1"),
+        .package(name: "MultiplicativeArithmetic", url: "https://github.com/RougeWare/Swift-MultiplicativeArithmetic.git", from: "1.4.1"),
     ],
     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: "RectangleTools",
-            dependencies: ["MultiplicativeArithmetic"]),
+            dependencies: ["MultiplicativeArithmetic"],
+            swiftSettings: [.swiftLanguageMode(.v5)]),
         .testTarget(
             name: "RectangleToolsTests",
             dependencies: ["RectangleTools"]),