Merge pull request #5 from Quantum2/master

Add watchOS minimum version

Author: ay42

Package.swift

@@ -6,7 +6,7 @@ import PackageDescription
 let package = Package(
     name: "Shapes",
     platforms: [
-        .iOS(.v13), .macOS(.v10_15)
+        .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.