Unhandled exception (bb31f9e4)

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/tallby/zeus-scanner/zeus-scanner/var/search/selenium_search.py", line 268, in parse_search_results
tor=tor, batch=batch, xforward=forward_for
File "/home/tallby/zeus-scanner/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-4.4.0-19041-Microsoft-x86_64-with-Ubuntu-20.04-focal`

Commands used:
`./zeus.py --dork index.php?id= -B -E --verbose`

Log file info:
```2020-10-04 06:04:27,946;zeus-log;DEBUG;checking if the application has been run before
2020-10-04 06:04:29,070;zeus-log;DEBUG;running with options '{'noExclude': True, 'useBing': True, 'dorkToUse': 'index.php?id=', 'runInVerbose': True}'
2020-10-04 06:04:29,160;zeus-log;INFO;log file being saved to '/home/tallby/zeus-scanner/zeus-scanner/log/zeus-log-3.log'
2020-10-04 06:04:29,194;zeus-log;DEBUG;using 'Bing' as the search engine
2020-10-04 06:04:29,225;zeus-log;INFO;specified to use non-default search engine
2020-10-04 06:04:29,229;zeus-log;INFO;starting dork scan with query 'index.php?id='
2020-10-04 06:04:29,230;zeus-log;DEBUG;parsing blacklist
2020-10-04 06:04:29,281;zeus-log;DEBUG;checking for user-agent and proxy configuration
2020-10-04 06:04:29,282;zeus-log;INFO;attempting to gather query URL
2020-10-04 06:04:29,284;zeus-log;INFO;setting up virtual display to hide the browser
2020-10-04 06:04:29,285;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/tallby/zeus-scanner/zeus-scanner/var/search/selenium_search.py", line 268, in parse_search_results
tor=tor, batch=batch, xforward=forward_for
File "/home/tallby/zeus-scanner/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'

2020-10-04 06:11:50,952;zeus-log;INFO;Zeus got an unexpected error and will automatically create an issue for this error, please wait
2020-10-04 06:11:51,099;zeus-log;INFO;getting authorization
2020-10-04 06:11:51,294;zeus-log;INFO;extracting traceback from log file
2020-10-04 06:11:51,550;zeus-log;INFO;attempting to get firefox browser version
```