Don't run screenshot test on environments without phantomjs 2.0+

spec/features/asciicast_spec.rb

@@ -19,7 +19,7 @@ feature "Asciicast page", :js => true do
     [ChunkyPNG::Color.r(color), ChunkyPNG::Color.g(color), ChunkyPNG::Color.b(color)]
   end
 
-  scenario 'Requesting PNG' do
+  scenario 'Requesting PNG', needs_phantomjs_2_bin: true do
     visit asciicast_path(asciicast, format: :png)
 
     expect(current_path).to match(%r{/uploads/test/asciicast/image/\d+/\w+\.png$})

spec/spec_helper.rb

@@ -26,6 +26,7 @@ RSpec.configure do |config|
   config.run_all_when_everything_filtered = true
   config.filter_run_excluding :unstable if ENV['RSPEC_EXCLUDE_UNSTABLE']
   config.filter_run_excluding :needs_terminal_bin unless File.executable?("src/terminal")
+  config.filter_run_excluding :needs_phantomjs_2_bin unless `phantomjs --version`[0] == '2'
 
   # Many RSpec users commonly either run the entire suite or an individual
   # file, and it's useful to allow more verbose output when running an