text: Title: Current version of chromedriver breaks pinned version of selenium
  Body: Running the tests on my Ubuntu 20.4 server against tag `5d` resulted in
  
  ```
  test_admin_home_page (test_selenium.SeleniumTestCase) ... skipped 'Web browser not available'
  ```
  
  So I hacked `tests/test_selenium.py` to add code to re-raise the exception caught in `SeleniumTestCase.setUpClass()` which got me
  
  ```
  ERROR: setUpClass (test_selenium.SeleniumTestCase)
  ----------------------------------------------------------------------
  Traceback (most recent call last):
    File "/home/bkline/repos/flasky/tests/test_selenium.py", line 19, in setUpClass
      cls.client = webdriver.Chrome(chrome_options=options)
    File "/home/bkline/repos/flasky/venv/lib/python3.8/site-packages/selenium/webdriver/chrome/webdriver.py", line 65, in __init__
      RemoteWebDriver.__init__(
    File "/home/bkline/repos/flasky/venv/lib/python3.8/site-packages/selenium/webdriver/remote/webdriver.py", line 98, in __init__
      self.start_session(desired_capabilities, browser_profile)
    File "/home/bkline/repos/flasky/venv/lib/python3.8/site-packages/selenium/webdriver/remote/webdriver.py", line 188, in start_session
      response = self.execute(Command.NEW_SESSION, parameters)
    File "/home/bkline/repos/flasky/venv/lib/python3.8/site-packages/selenium/webdriver/remote/webdriver.py", line 256, in execute
      self.error_handler.check_response(response)
    File "/home/bkline/repos/flasky/venv/lib/python3.8/site-packages/selenium/webdriver/remote/errorhandler.py", line 194, in check_response
      raise exception_class(message, screen, stacktrace)
  selenium.common.exceptions.WebDriverException: Message: invalid argument: unrecognized capability: chromeOptions
  ```
  
  A little more digging found some [advice](https://stackoverflow.com/questions/57995521/selenium-common-exceptions-webdriverexception-message-invalid-argument-unreco) which suggested upgrading `selenium` to accommodate changes to the behavior of the launcher in `chromedriver`. Sure enough, running `pip install -U selenium` got the selenium test back in the game. So it would seem that the requirements documents need to be updated to bump the version of `selenium`. I'm at 3.141.0 which is what PyPI is currently serving up. I haven't done the testing to determine the minimum version needed to avoid the breakage I ran into, but I'm not seeing any adverse side effects from this version.
  
  ```bash
  (venv) $ grep selenium requirements/dev.txt 
  selenium==3.4.3
  (venv) $ pip freeze | grep selenium
  selenium==3.141.0
  (venv) $ dpkg -l | grep chromium
  ii  chromium-browser                       1:85.0.4183.83-0ubuntu0.20.04.2             amd64        Transitional package - chromium-browser -> chromium snap
  ii  chromium-chromedriver                  1:85.0.4183.83-0ubuntu0.20.04.2             amd64        Transitional package - chromium-chromedriver -> chromium snap
  ```