[rb] mark downloads test as pending the next release

Author: titusfortner

examples/ruby/spec/drivers/remote_webdriver_spec.rb

@@ -32,7 +32,7 @@
     expect(file_name.text).to eq 'selenium-snapshot.png'
   end
 
-  it 'downloads' do
+  it 'downloads', pending: 'enable_downloads accessor added in trunk' do
     options = default_chrome_options
     options.enable_downloads = true
     driver = Selenium::WebDriver.for :remote, url: grid_url, options: options