Fix bug in ws_thread.py.

Use future.utils.iteritems instead of iter(), add future to
requirements.

README.md

@@ -2,7 +2,7 @@
 
 This is a library-like application, which operates with orders and positions on your account.
 
-*Current version:* **0.4**
+*Current version:* **0.4.1**
 #### Features:
 * Creating an cancelling orders on your account. Stop-loss, Limit, passive, reduce-only, close-only, hidden orders supported.
 * Preventing these orders for being lost, cancelled or rejected: Supervisor will place them anew.

requirements.txt

@@ -4,4 +4,5 @@ idna==2.9
 requests==2.23.0
 six==1.14.0
 urllib3==1.25.9
-websocket-client==0.56.0
+websocket-client==0.56.0
+future==0.18.2

supervisor/__init__.py

@@ -1,3 +1,3 @@
 from supervisor._supervisor import *
 
-__version__ = '0.4'
+__version__ = '0.4.1'

supervisor/core/ws_thread.py

@@ -11,6 +11,7 @@
 from supervisor.core.utils.log import setup_custom_logger
 from supervisor.core.utils.math import toNearest
 from urllib.parse import urlparse, urlunparse
+from future.utils import iteritems
 
 
 class BitMEXWebsocket:
@@ -98,7 +99,7 @@ def get_ticker(self, symbol):
             }
 
         # The instrument has a tickSize. Use it to round values.
-        return {k: toNearest(float(v or 0), instrument['tickSize']) for k, v in iter(ticker)}
+        return {k: toNearest(float(v or 0), instrument['tickSize']) for k, v in iteritems(ticker)}
 
     def funds(self):
         return self.data['margin'][0]