Update test_exchange_client.py

Author: Coinbene

test_exchange_client.py

@@ -1,4 +1,9 @@
 import unittest
+import sys
+import os
+curPath = os.path.abspath(os.path.dirname(__file__))
+rootPath = os.path.split(curPath)[0]
+sys.path.append(rootPath)
 
 from exchange.ExchangeClient import ExchangeClient