Update Zcash entries to match spec version 2016.0-beta-1.8 (#18)

coins.json

@@ -100,9 +100,9 @@
 }, {
 	"coin_name": "Zcash",
 	"coin_shortcut": "ZEC",
-	"address_type": 65,
+	"address_type": 7352,
 	"maxfee_kb": 1000000,
-	"address_type_p2sh": 5,
+	"address_type_p2sh": 7357,
 	"address_type_p2wpkh": null,
 	"address_type_p2wsh": null,
 	"signed_message_header": "Zcash Signed Message:\n",
@@ -114,15 +114,14 @@
 		"Normal": 10
 	}
 }, {
-	"comment": "Zcash testnet",
-	"coin_name": "Testnet",
+	"coin_name": "Zcash Testnet",
 	"coin_shortcut": "TAZ",
-	"address_type": 111,
+	"address_type": 7461,
 	"maxfee_kb": 10000000,
-	"address_type_p2sh": 196,
-	"address_type_p2wpkh": 3,
-	"address_type_p2wsh": 40,
-	"signed_message_header": "Bitcoin Signed Message:\n",
+	"address_type_p2sh": 7354,
+	"address_type_p2wpkh": null,
+	"address_type_p2wsh": null,
+	"signed_message_header": "Zcash Signed Message:\n",
 	"hash_genesis_block": "0cdf00b25a93ded11d73ebe1728cf7867f18e1f62aca9554b95e0f3026174e33",
 	"xpub_magic": "043587cf",
 	"xprv_magic": "04358394",