docs: we do not support safari (#309)

packages/axe-core-capybara/README.md

@@ -35,8 +35,7 @@ The configure method takes 1 optional argument as a [symbol][] and a  configurat
 
 The optional argument is a browser name for `capybara`. The valid browser names are:
 - `:firefox` (default)
-- `:chrome` 
-- `:safari`
+- `:chrome`
 
 > Note: Please ensure respective drivers (eg: [`geckodriver`][]) are installed in your machine.
 
@@ -66,4 +65,4 @@ bundle exec rspec
 [axe API]: https://github.com/dequelabs/axe-core/blob/develop/doc/API.md
 [Capybara Webdriver]: https://github.com/teamcapybara/capybara/
 [`geckodriver`]: https://github.com/mozilla/geckodriver/releases
-[symbol]: https://ruby-doc.org/core-2.5.0/Symbol.html
+[symbol]: https://ruby-doc.org/core-2.5.0/Symbol.html