Fix deprecation warning re import from collections

 | /usr/local/lib/python3.7/site-packages/tarantool/response.py:25
 |   /usr/local/lib/python3.7/site-packages/tarantool/response.py:25:
 |   DeprecationWarning: Using or importing the ABCs from 'collections'
 |   instead of from 'collections.abc' is deprecated, and in 3.8 it will
 |   stop working
 |     class Response(collections.Sequence):

Author: olegrok

tarantool/response.py

@@ -1,7 +1,12 @@
 # -*- coding: utf-8 -*-
 # pylint: disable=C0301,W0105,W0401,W0614
 
-import collections
+try:
+    # Python 3.3+
+    from collections.abc import Sequence
+except ImportError:
+    # Python 2
+    from collections import Sequence
 
 import json
 import msgpack
@@ -22,7 +27,7 @@
 )
 
 
-class Response(collections.Sequence):
+class Response(Sequence):
     '''
     Represents a single response from the server in compliance with the
     Tarantool protocol.