fix fn name

Author: matiu

lib/TransactionDb.js

@@ -40,7 +40,7 @@ var bitcore  = require('bitcore'),
     buffertools    = require('buffertools');
 
 var logger = require('./logger').logger;
-var inf   = logger.inf;
+var inf   = logger.info;
 
 var db           = imports.db || levelup(config.leveldb + '/txs',{maxOpenFiles: MAX_OPEN_FILES} );
 var PoolMatch     = imports.poolMatch || require('soop').load('./PoolMatch',config);