Add "multiprocess" lib to setup.py "tests_require"

Author: hballard

setup.py

@@ -31,6 +31,6 @@
     ],
     tests_require=[
         'pytest', 'pytest-mock', 'fakeredis', 'graphene', 'subprocess32',
-        'flask', 'flask-graphql', 'flask-sockets'
+        'flask', 'flask-graphql', 'flask-sockets', 'multiprocess'
     ],
     include_package_data=True)

tests/test_subscription_transport.py

@@ -7,7 +7,6 @@
 from functools import wraps
 import copy
 import json
-import multiprocess
 import os
 import sys
 
@@ -18,6 +17,7 @@
 from promise import Promise
 import fakeredis
 import graphene
+import multiprocess
 import pytest
 import redis