Encrypted channels support (by default) with SPM integration

- Changes the target name from 'PusherSwift' to 'PusherSwiftWithEncryption'
- Adds swift-sodium 0.9.0 as a dependency of the target
- Udpates the README

Author: danielrbrowne

Package.resolved

@@ -6,27 +6,29 @@ let package = Package(
     name: "PusherSwift",
     platforms: [.iOS("13.0"), .macOS("10.15"), .tvOS("13.0")],
     products: [
-        .library(name: "PusherSwift", targets: ["PusherSwift"])
+        .library(name: "PusherSwift", targets: ["PusherSwiftWithEncryption"])
     ],
     dependencies: [
         .package(url: "https://github.com/ashleymills/Reachability.swift.git", .upToNextMajor(from: "5.0.0")),
         .package(url: "https://github.com/pusher/NWWebSocket.git", .upToNextMajor(from: "0.3.0")),
+        .package(url: "https://github.com/jedisct1/swift-sodium", .upToNextMajor(from: "0.9.0")),
     ],
     targets: [
         .target(
-            name: "PusherSwift",
+            name: "PusherSwiftWithEncryption",
             dependencies: [
                 "Reachability",
                 "NWWebSocket",
+                "Sodium",
             ],
             path: "Sources",
-            exclude: ["PusherSwiftWithEncryption-Only"]
+            exclude: ["PusherSwift-Only"]
         ),
         .testTarget(
-            name: "PusherSwiftTests",
-            dependencies: ["PusherSwift"],
+            name: "PusherSwiftWithEncryptionTests",
+            dependencies: ["PusherSwiftWithEncryption"],
             path: "Tests",
-            exclude: ["Unit/PusherSwiftWithEncryption-Only"]
+            exclude: ["Unit/PusherSwift-Only"]
         )
     ],
     swiftLanguageVersions: [.v5]

Package.swift

@@ -132,8 +132,6 @@ Using Carthage under Xcode 12.0 and above currently requires [a workaround](http
 
 ### Swift Package Manager
 
-> Please note that if you are looking to use encrypted channels, this is not currently possible with Swift Package Manager.
-
 To integrate PusherSwift into your project using [Swift Package Manager](https://swift.org/package-manager/), you can add the library as a dependency in Xcode (11 and above) – see the [docs](https://developer.apple.com/documentation/xcode/adding_package_dependencies_to_your_app). The package repository URL is:
 
 ```bash
@@ -164,6 +162,8 @@ let package = Package(
 )
 ```
 
+You will then need to include an `import PusherSwiftWithEncryption` statement in any source files where you wish to use the SDK. (**N.B. When integrating using Swift Package Manager, encrypted channels are supported by default and there is no 'PusherSwift' module**).
+
 ## Configuration
 
 There are a number of configuration parameters which can be set for the Pusher client. For Swift usage they are:
@@ -650,7 +650,7 @@ Update your Podfile to include `PusherSwiftWithEncryption` instead of `PusherSwi
 You do not need to change your Cartfile. However, you will need to import the `PusherSwiftWithEncryption` framework into your project, instead of `PusherSwift`. You will also need to import the `Sodium` framework into your project (in addition to `Reachability`).
 
 #### Swift Package Manager
-PusherSwiftWithEncryption is not yet compatible with the Swift Package Manager.
+Encrypted channels are supported by default when integrating using Swift Package Manager. No code or configuration changes are required.
 
 #### Limitations