[Mod] WebsocketClient改名为WebSocketClient

tests/all_test.py

@@ -2,6 +2,7 @@ import unittest
 
 # noinspection PyUnresolvedReferences
 from restful.RestfulClientTest import *
+from restful.WebSocketClientTest import *
 
 if __name__ == "__main__":
     unittest.main()

tests/restful/WebSocketClientTest.py

@@ -3,7 +3,7 @@ import json
 import unittest
 
 from Promise import Promise
-from vnpy.restful.WebsocketClient import WebsocketClient
+from vnpy.restful.WebSocketClient import WebsocketClient
 
 
 class TestWebsocketClient(WebsocketClient):