update require env

Author: zhxf2012

Package.swift

@@ -5,6 +5,7 @@ import PackageDescription
 
 let package = Package(
     name: "PathText",
+    platforms: [ .macOS(.v10_15), .iOS(.v13) ],
     products: [
         // Products define the executables and libraries produced by a package, and make them visible to other packages.
         .library(