Use sorted keys when encoding using the JSON strategy (#20)

* Use sorted keys when encoding using the JSON strategy

* Bump macOS min deployment target to 10.13 and tvOS to 11

Package.swift

@@ -6,10 +6,10 @@ import PackageDescription
 let package = Package(
     name: "swift-user-defaults",
     platforms: [
-        .macOS(.v10_12),
+        .macOS(.v10_13),
         .iOS(.v11),
         .watchOS(.v7),
-        .tvOS(.v10)
+        .tvOS(.v11)
     ],
     products: [
         .library(name: "SwiftUserDefaults", targets: ["SwiftUserDefaults"]),

Sources/SwiftUserDefaults/UserDefaults+CodingStrategy.swift

@@ -42,7 +42,9 @@ public extension UserDefaults.CodingStrategy {
     func encode<T: Encodable>(_ value: T) throws -> Data {
         switch self {
         case .json:
-            return try JSONEncoder().encode(value)
+            let encoder = JSONEncoder()
+            encoder.outputFormatting = .sortedKeys
+            return try encoder.encode(value)
         case .plist:
             return try PropertyListEncoder().encode(value)
         }

swift-user-defaults.podspec

@@ -11,8 +11,8 @@ Pod::Spec.new do |s|
   s.swift_version = "5.3"
 
   s.ios.deployment_target = '11.0'
-  s.osx.deployment_target = '10.12'
-  s.tvos.deployment_target = '10.0'
+  s.osx.deployment_target = '10.13'
+  s.tvos.deployment_target = '11.0'
   s.watchos.deployment_target = '7'
 
   # Run Unit Tests