Make CallbackURLKit Xcode 11 Swift Package Manager compatible.

Author: dispatchqueue

CallbackURLKit.xcodeproj/project.pbxproj

@@ -445,7 +445,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
 				MACOSX_DEPLOYMENT_TARGET = 10.14;
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
@@ -500,7 +500,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
 				MACOSX_DEPLOYMENT_TARGET = 10.14;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;

Package.swift

@@ -1,3 +1,4 @@
+// swift-tools-version:5.0
 // Package.swift
 /*
  The MIT License (MIT)
@@ -22,5 +23,15 @@
 import PackageDescription
 
 let package = Package(
-  name: "CallbackURLKit"
+    name: "CallbackURLKit",
+    platforms: [.iOS(.v11), .macOS(.v10_14), .tvOS(.v10)],
+    products: [
+        .library(name: "CallbackURLKit", targets: ["CallbackURLKit"])
+    ],
+    targets: [
+        .target(
+            name: "CallbackURLKit",
+            path: "Sources"
+        )
+    ]
 )