This is the error i get using the newest yahoo games network sdk in unity 5, i get the same error in my other game projects as well.
This overload is deprecated. Use the one with Dictionary argument.
UnityEngine.WWW:.ctor(String, Byte[], Hashtable)
PlayerIOClient.Internal.identifier804:getRequest(Int32, identifier1042)
PlayerIOClient.Internal.identifier806:MoveNext()
UnityEngine.MonoBehaviour:StartCoroutine(IEnumerator)
PlayerIOClient.Internal.identifier49:Enqueue(IEnumerator)
PlayerIOClient.Internal.identifier804:Call(Int32, identifier119, Callback`1, Callback`1)
PlayerIOClient.Internal.identifier117:Connect(String, String, String, String, String, List`1, String, Dictionary`2, Callback`1, Callback`1)
PlayerIOClient.PlayerIO:Connect(String, String, String, String, String, String[], Callback`1, Callback`1)
GameManager:Start() (at Assets/Scripts/GameManager.cs:48)