selenium 0.1.4

• Added chrome_options(), firefox_options() and edge_options() to help
  with the capabilities argument in SeleniumSession$new(). The documentation
  there includes several links that document the options available for each
  browser, along with a few examples.
• The error argument in wait_for_selenium_available() now defaults to
  TRUE. This means that the function will throw an error if a Selenium server
  is not available by default.
• Added wait_for_server(), a version of wait_for_selenium_available() that
  gives more detailed error messages by reading the logs of a server process
  created using selenium_server().
• Fixed a bug in selenium_server() where fetching the latest version
  didn't work when Selenium was preparing to release a new version.