Remove more doubleEncode stuff

Author: nuclearace

Source/SocketEngine.swift

@@ -66,10 +66,6 @@ public final class SocketEngine : NSObject, URLSessionDelegate, SocketEnginePoll
     /// An array of HTTPCookies that are sent during the connection.
     public private(set) var cookies: [HTTPCookie]?
 
-    /// Set to `true` if using the node.js version of socket.io. The node.js version of socket.io
-    /// handles utf8 incorrectly.
-    public private(set) var doubleEncodeUTF8 = true
-
     /// A dictionary of extra http headers that will be set during connection.
     public private(set) var extraHeaders: [String: String]?
 
@@ -153,8 +149,6 @@ public final class SocketEngine : NSObject, URLSessionDelegate, SocketEnginePoll
                 connectParams = params
             case let .cookies(cookies):
                 self.cookies = cookies
-            case let .doubleEncodeUTF8(encode):
-                doubleEncodeUTF8 = encode
             case let .extraHeaders(headers):
                 extraHeaders = headers
             case let .sessionDelegate(delegate):

Source/SocketEngineSpec.swift

@@ -39,10 +39,6 @@ import Foundation
     /// The connect parameters sent during a connect.
     var connectParams: [String: Any]? { get set }
 
-    /// Set to `true` if using the node.js version of socket.io. The node.js version of socket.io
-    /// handles utf8 incorrectly.
-    var doubleEncodeUTF8: Bool { get }
-
     /// An array of HTTPCookies that are sent during the connection.
     var cookies: [HTTPCookie]? { get }