Replace deprecated headless! Selenium::WebDriver::Chrome::Options (#333)

Author: gustavosobral

lib/billy/browsers/capybara.rb

@@ -84,7 +84,7 @@ def self.register_selenium_driver
 
         ::Capybara.register_driver :selenium_chrome_headless_billy do |app|
             options = Selenium::WebDriver::Chrome::Options.new
-            options.headless!
+            options.add_argument('--headless=new')
             options.add_argument('--enable-features=NetworkService,NetworkServiceInProcess')
             options.add_argument('--ignore-certificate-errors')
             options.add_argument("--proxy-server=#{Billy.proxy.host}:#{Billy.proxy.port}")