build error with python3

Hello,

I try to build burp-ui with python3. Here is a bug report:

Bug summary

$ python3 ./setup.py build Traceback (most recent call last): File "./setup.py", line 234, in from burpui.desc import author, author_email, description,
File "/home/general/Projekte/RPMS/home:stefjakobs/burp-ui/burp-ui-0.6.5/burpui/init.py", line 15, in from .app import init File "/home/general/Projekte/RPMS/home:stefjakobs/burp-ui/burp-ui-0.6.5/burpui/app.py", line 19, in from .extensions import create_celery, create_db, create_websocket,
File "/home/general/Projekte/RPMS/home:stefjakobs/burp-ui/burp-ui-0.6.5/burpui/extensions.py", line 312 from .ext.async import celery ^ SyntaxError: invalid syntax

Sysinfo

python3 --version
Python 3.7.2

Steps to reproduce

1. tar xzf burp-ui-0.6.5.tar.gz
2. cd burp-ui-0.6.5 3 python3 ./setup.py build

logs

$ python3 ./setup.py build
Traceback (most recent call last):
  File "./setup.py", line 234, in <module>
    from burpui.desc import __author__, __author_email__, __description__, \
  File "/home/general/Projekte/RPMS/home:stefjakobs/burp-ui/burp-ui-0.6.5/burpui/__init__.py", line 15, in <module>
    from .app import init
  File "/home/general/Projekte/RPMS/home:stefjakobs/burp-ui/burp-ui-0.6.5/burpui/app.py", line 19, in <module>
    from .extensions import create_celery, create_db, create_websocket, \
  File "/home/general/Projekte/RPMS/home:stefjakobs/burp-ui/burp-ui-0.6.5/burpui/extensions.py", line 312
    from .ext.async import celery

Thanks