Unhandled exception (f379531c)

Zeus version:
`1.5.2.21b875`

Firefox version:
`(56, 0)`

Geckodriver version:
`geckodriver-v0.18.0-linux64.tar.gz`

Error info:
```Traceback (most recent call last):
File "/home/unroot/zeus-scanner/var/search/selenium_search.py", line 268, in parse_search_results
tor=tor, batch=batch, xforward=forward_for
File "/home/unroot/zeus-scanner/var/search/selenium_search.py", line 80, in get_urls
ff_display = Display(visible=0, size=(800, 600))
File "/usr/local/lib/python2.7/dist-packages/pyvirtualdisplay/display.py", line 34, in __init__
self._obj = self.display_class(
File "/usr/local/lib/python2.7/dist-packages/pyvirtualdisplay/display.py", line 52, in display_class
cls.check_installed()
File "/usr/local/lib/python2.7/dist-packages/pyvirtualdisplay/xvfb.py", line 38, in check_installed
ubuntu_package=PACKAGE).check_installed()
TypeError: __init__() got an unexpected keyword argument 'url'
```

Running details:
`Linux-5.6.0-kali2-amd64-x86_64-with-debian-kali-rolling`

Commands used:
`./zeus.py -r`

Log file info:
```2020-06-24 23:43:26,199;zeus-log;INFO;log file being saved to '/home/unroot/zeus-scanner/log/zeus-log-17.log'
2020-06-24 23:43:26,199;zeus-log;INFO;using default search engine
2020-06-24 23:43:26,202;zeus-log;INFO;using random dork 'inurl:home.php?rub=' as the search query
2020-06-24 23:43:26,203;zeus-log;WARNING;will not parse webcache URL's (to parse webcache pass -W)
2020-06-24 23:43:26,204;zeus-log;WARNING;only pulling URLs with GET(query) parameters (to pull all URL's pass -E)
2020-06-24 23:43:26,204;zeus-log;INFO;attempting to gather query URL
2020-06-24 23:43:26,205;zeus-log;INFO;setting up virtual display to hide the browser
2020-06-24 23:43:26,205;zeus-log;ERROR;selenium_search.pyc failed to gather the URL from search engine, caught exception '__init__() got an unexpected keyword argument 'url'' exception has been logged to current log file
Traceback (most recent call last):
File "/home/unroot/zeus-scanner/var/search/selenium_search.py", line 268, in parse_search_results
tor=tor, batch=batch, xforward=forward_for
File "/home/unroot/zeus-scanner/var/search/selenium_search.py", line 80, in get_urls
ff_display = Display(visible=0, size=(800, 600))
File "/usr/local/lib/python2.7/dist-packages/pyvirtualdisplay/display.py", line 34, in __init__
self._obj = self.display_class(
File "/usr/local/lib/python2.7/dist-packages/pyvirtualdisplay/display.py", line 52, in display_class
cls.check_installed()
File "/usr/local/lib/python2.7/dist-packages/pyvirtualdisplay/xvfb.py", line 38, in check_installed
ubuntu_package=PACKAGE).check_installed()
TypeError: __init__() got an unexpected keyword argument 'url'

2020-06-24 23:43:47,362;zeus-log;INFO;Zeus got an unexpected error and will automatically create an issue for this error, please wait
2020-06-24 23:43:47,362;zeus-log;INFO;getting authorization
2020-06-24 23:43:47,400;zeus-log;INFO;extracting traceback from log file
2020-06-24 23:43:47,401;zeus-log;INFO;attempting to get firefox browser version
```

Start in var/search/selenium_search.py at line 80, where Display is initialized, and trace the call from parse_search_results around line 268. Reproduce the failure with ./zeus.py -r and inspect the pyvirtualdisplay error shown in the traceback. Done means the search run no longer raises the unexpected keyword argument 'url' exception.

Written by the indexing model from the issue text.