Merge pull request #182 from fujicoin/fix_for_v0.20

Fix for COINBASE_FLAGS removed in Bitcoin v0.20.0

lib/transactions.js

@@ -245,7 +245,7 @@ exports.CreateGeneration = function(rpcData, publicKey, extraNoncePlaceholder, r
 
     var scriptSigPart1 = Buffer.concat([
         util.serializeNumber(rpcData.height),
-        new Buffer(rpcData.coinbaseaux.flags, 'hex'),
+        new Buffer([]),
         util.serializeNumber(Date.now() / 1000 | 0),
         new Buffer([extraNoncePlaceholder.length])
     ]);