Swift 5.1 support

Author: nikola-mladenovic

Package.swift

@@ -1,13 +1,13 @@
-// swift-tools-version:4.2
+// swift-tools-version:5.1
 
 import PackageDescription
 
 let package = Package(
     name: "AwsSns",
     products: [.library(name: "AwsSns", targets: ["AwsSns"])],
-    dependencies: [.package(url: "https://github.com/nikola-mladenovic/AwsSwiftSign.git", from: "0.2.0"),
-                   .package(url: "https://github.com/drmohundro/SWXMLHash.git", from: "4.7.1")],
+    dependencies: [.package(url: "https://github.com/nikola-mladenovic/AwsSwiftSign.git", from: "0.3.0"),
+                   .package(url: "https://github.com/drmohundro/SWXMLHash.git", from: "5.0.1")],
     targets: [.target(name: "AwsSns", dependencies: ["AwsSign", "SWXMLHash"]),
               .testTarget(name: "AwsSnsTests", dependencies: ["AwsSns"])],
-    swiftLanguageVersions: [.v4_2]
+    swiftLanguageVersions: [.v5]
 )

README.md

@@ -7,7 +7,7 @@ AwsSns is a Swift library that enables you to use Amazon Web Service Simple Noti
 <img src="https://travis-ci.org/nikola-mladenovic/AwsSwiftSNSsdk.svg?branch=master">
 </a>
 <a href="https://developer.apple.com/swift/" target="_blank">
-<img src="https://img.shields.io/badge/Swift-4.2-orange.svg?style=flat" alt="Swift 4.2">
+<img src="https://img.shields.io/badge/Swift-5.1-orange.svg?style=flat" alt="Swift 5.1">
 </a>
 <a href="https://developer.apple.com/swift/" target="_blank">
 <img src="https://img.shields.io/badge/Platforms-iOS%20%7C%20macOS%20%7C%20watchOS%20%7C%20tvOS%20%7C%20Linux-4E4E4E.svg?colorA=EF5138" alt="Platforms iOS | macOS | watchOS | tvOS | Linux">
@@ -17,7 +17,7 @@ AwsSns is a Swift library that enables you to use Amazon Web Service Simple Noti
 </a>
 </p>
 
-This package builds with Swift Package Manager. Ensure you have installed and activated the latest Swift 4.2 tool chain.
+This package builds with Swift Package Manager. Ensure you have installed and activated the latest Swift 5.1 tool chain.
 
 ## Quick Start
 

Sources/AwsSns/AwsSns.swift

@@ -1,4 +1,7 @@
 import Foundation
+#if canImport(FoundationNetworking)
+import FoundationNetworking
+#endif
 import AwsSign
 import SWXMLHash