dependencies update

Package.swift

@@ -5,6 +5,9 @@ import PackageDescription
 
 let package = Package(
     name: "EasyNodeEditor",
+    platforms: [
+        .macOS(.v10_15)
+    ],
     products: [
         // Products define the executables and libraries a package produces, and make them visible to other packages.
         .library(

Sources/EasyNodeEditor/EasyNodeEditor.swift

@@ -1,6 +1,4 @@
-public struct EasyNodeEditor {
-    public private(set) var text = "Hello, World!"
 
-    public init() {
-    }
+@available(macOS 10.15, *)
+public struct EasyNodeEditor {
 }