Payment.refund API not backward compatible

[shikhart98]

In current implementation as of v1.3.0, in Payment class there are 2 refund function definitions, always the later one will be picked and will not be backward compatible!

Function overloading won't work here.
https://github.com/razorpay/razorpay-python/blob/master/razorpay/resources/payment.py#L52
https://github.com/razorpay/razorpay-python/blob/master/razorpay/resources/payment.py#L120

[ankitdas13]

@shikhart98 Sorry for the delay. Both functions are the same, but thanks for informing this to us. We will update this in the next release.