Force library to use Starscream 4.0.6 due to breaking Starscream minor version changes

Author: StuartCameronCode

Package.swift

@@ -10,7 +10,7 @@ let package = Package(
         .library(name: "SwiftStomp", targets: ["SwiftStomp"])
     ],
     dependencies: [
-        .package(url: "https://github.com/daltoniam/Starscream.git", .upToNextMinor(from: "4.0.6")),
+        .package(url: "https://github.com/daltoniam/Starscream.git", .exact("4.0.6")),
         .package(url: "https://github.com/ashleymills/Reachability.swift", .upToNextMinor(from: "5.0.0"))
     ],
     targets: [