Merge pull request #190 from abitmore/patch-5

Update ecdsa.py

Author: xeroc

graphenebase/ecdsa.py

@@ -105,7 +105,7 @@ def recover_public_key(digest, signature, i, message=None):
             message = bytes(message, "utf-8")  # pragma: no cover
         sigder = encode_dss_signature(r, s)
         public_key = ec.EllipticCurvePublicNumbers(
-            Q._Point__x, Q._Point__y, ec.SECP256K1()
+            Q.x(), Q.y(), ec.SECP256K1()
         ).public_key(default_backend())
         public_key.verify(sigder, message, ec.ECDSA(hashes.SHA256()))
         return public_key