Added external parameter name for queue in the response method.

Source/ResponseSerialization.swift

@@ -74,7 +74,7 @@ extension Request {
         - returns: The request.
     */
     public func response(
-        queue: dispatch_queue_t? = nil,
+        queue queue: dispatch_queue_t? = nil,
         completionHandler: (NSURLRequest?, NSHTTPURLResponse?, NSData?, NSError?) -> Void)
         -> Self
     {
@@ -98,7 +98,7 @@ extension Request {
         - returns: The request.
     */
     public func response<T: ResponseSerializer, V where T.SerializedObject == V>(
-        queue: dispatch_queue_t? = nil,
+        queue queue: dispatch_queue_t? = nil,
         responseSerializer: T,
         completionHandler: (NSURLRequest?, NSHTTPURLResponse?, Result<V>) -> Void)
         -> Self

Tests/CacheTests.swift

@@ -181,7 +181,7 @@ class CacheTestCase: BaseTestCase {
 
         let request = manager.request(urlRequest)
         request.response(
-            queue,
+            queue: queue,
             completionHandler: { _, response, data, _ in
                 completion(request.request, response)
             }