Tasks PQ queue_class isn't used about pq

[LuisAlejandro]

I'm experiencing this error and I assume it has something to do with this issue:

>>> from pq.tasks import PQ
>>> from psycopg2 import connect as psqlconnect
>>> database_url = "..."
>>> pgconn = psqlconnect(database_url)
>>> p = PQ(pgconn)
>>> tq = p['tasks']
>>> @tq.task()
... def hi():
...   pass
... 
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'Queue' object has no attribute 'task'

In order to fix this I had to patch the queue_class attribute with Queue class from pq.tasks, like this:

>>> from pq.tasks import PQ
>>> from psycopg2 import connect as psqlconnect
>>> database_url = "..."
>>> pgconn = psqlconnect(database_url)
>>> p = PQ(pgconn)
>>> import pq
>>> p.queue_class = pq.tasks.Queue
>>> tq = p['tasks']
>>> @tq.task()
... def hi():
...   pass
... 
>>>