update ropsten forkCanonHash, forkBlock (#11247)

value taken from https://ropsten.etherscan.io/block/6485847

Author: joshua-mir

ethcore/res/ethereum/ropsten.json

@@ -28,8 +28,8 @@
 		"maximumExtraDataSize": "0x20",
 		"minGasLimit": "0x1388",
 		"networkID": "0x3",
-		"forkBlock": "0x40E80F",
-		"forkCanonHash": "0x3e12d5c0f8d63fbc5831cc7f7273bd824fa4d0a9a4102d65d99a7ea5604abc00",
+		"forkBlock": "0x62f757",
+		"forkCanonHash": "0x3a024a13310ec9b4805f681b17c3ae6c94167d1c6494e83d70a887ebc27df5ea",
 		"maxCodeSize": "0x6000",
 		"maxCodeSizeTransition": "0xa",
 		"eip150Transition": "0x0",