Merge remote-tracking branch 'origin/master' into development

* origin/master:
  Fix Starscream to version 4.0.4
  Remove unused var in SocketAckManagerTest.testManagerTimeoutAck

Author: nuclearace

Package.swift

@@ -8,7 +8,7 @@ let package = Package(
         .library(name: "SocketIO", targets: ["SocketIO"])
     ],
     dependencies: [
-        .package(url: "https://github.com/daltoniam/Starscream", .upToNextMinor(from: "4.0.0")),
+        .package(url: "https://github.com/daltoniam/Starscream", .exactItem("4.0.4")),
     ],
     targets: [
         .target(name: "SocketIO", dependencies: ["Starscream"]),

Tests/TestSocketIO/SocketAckManagerTest.swift

@@ -28,7 +28,6 @@ class SocketAckManagerTest : XCTestCase {
 
     func testManagerTimeoutAck() {
         let callbackExpection = expectation(description: "Manager should timeout ack with noAck status")
-        let itemsArray = ["Hi", "ho"]
 
         func callback(_ items: [Any]) {
             XCTAssertEqual(items.count, 1, "Timed out ack should have one value")