Remove SyncStatus, update availability

Should be able to add this as a dependency in iOS 13, macOS 10.15 or tvOS 13 and
have it properly state that it's only available in iOS 14, macOS 11, and tvOS 14.
Tests pass on iOS 14, macOS 10.15 and tvOS 14.

Package.swift

@@ -5,6 +5,10 @@ import PackageDescription
 
 let package = Package(
     name: "CloudKitSyncMonitor",
+    // platforms is set so you can include this package in projects that target iOS 13/macOS 10.15/tvOS 13 without
+    // getting errors, but the code in it is marked avaliable only for macOS 11 and iOS 14.
+    // It compiles and the tests pass on tvOS 14, but I haven't used it in a tvOS app.
+    platforms: [.macOS(.v10_15), .iOS(.v13), .tvOS(.v13)],
     products: [
         // Products define the executables and libraries a package produces, and make them visible to other packages.
         .library(

Sources/CloudKitSyncMonitor/SyncMonitor.swift

@@ -90,7 +90,7 @@ import SwiftUI
 ///         }
 ///     }
 ///
-@available(iOS 14.0, *)
+@available(iOS 14.0, macCatalyst 14.0, OSX 11, tvOS 14.0, *)
 public class SyncMonitor: ObservableObject {
     /// A singleton to use
     public static let shared = SyncMonitor()

Tests/CloudKitSyncMonitorTests/SyncMonitorTests.swift

@@ -11,7 +11,7 @@ import XCTest
 import CoreData
 @testable import CloudKitSyncMonitor
 
-@available(iOS 14.0, *)
+@available(iOS 14.0, macCatalyst 14.0, OSX 11, tvOS 14.0, *)
 final class SyncMonitorTests: XCTestCase {
     func testCanDetectImportError() {
         // Given an active network connection

Tests/CloudKitSyncMonitorTests/XCTestManifests.swift

@@ -3,7 +3,7 @@ import XCTest
 #if !canImport(ObjectiveC)
 public func allTests() -> [XCTestCaseEntry] {
     return [
-        testCase(SyncStatusTests.allTests),
+        testCase(SyncMonitorTests.allTests),
     ]
 }
 #endif