fix tests for txin

test/txin.js

@@ -1,8 +1,11 @@
+'use strict';
+
 var should = require('chai').should();
-var Script = require('../lib/script');
+var bitcore = require('..');
-var Txin = require('../lib/txin');
+var Script = bitcore.Script;
-var Varint = require('../lib/varint');
+var Txin = bitcore.Txin;
-var BufferReader = require('../lib/bufferreader');
+var Varint = bitcore.Varint;
+var BufferReader = bitcore.BufferReader;
 
 describe('Txin', function() {