add platform description

add platform description

Author: tiwu5566

Package.swift

@@ -10,14 +10,20 @@ import PackageDescription
 
 let package = Package(
     name: "FTPPublishDeploy",
+    platforms: [
+        .iOS(.v13),
+        .tvOS(.v13),
+        .watchOS(.v6),
+        .macOS(.v10_15)
+    ],
     products: [
         .library(
             name: "FTPPublishDeploy",
             targets: ["FTPPublishDeploy"]),
     ],
     dependencies: [
         .package(url: "https://github.com/johnsundell/files.git", from: "4.0.0"),
-        .package(url: "https://github.com/johnsundell/publish.git", from: "0.5.0"),
+        .package(url: "https://github.com/johnsundell/publish.git", from: "0.8.0"),
         .package(url: "https://github.com/johnsundell/shellout.git", from: "2.3.0"),
     ],
     targets: [