Fix regression displaying CLI help

Author: mattwynne

features/docs/cli/help.feature

@@ -0,0 +1,8 @@
+Feature: Help
+
+  Running `cucumber --help` shows you command-line options.
+
+  Scenario: Show help
+    When I run `cucumber --help`
+    Then it should pass
+    And I should see the CLI help

features/lib/step_definitions/cli_steps.rb

@@ -0,0 +1,3 @@
+Then(/^I should see the CLI help$/) do
+  expect(all_output).to include("Usage:")
+end

lib/cucumber/cli/options.rb

@@ -135,7 +135,7 @@ def parse!(args)
           end
 
           opts.on_tail("--version", "Show version.") { show_version }
-          opts.on_tail("-h", "--help", "You're looking at it.") { show_help }
+          opts.on_tail("-h", "--help", "You're looking at it.") { show_help(opts.help) }
         end.parse!
 
         @args.map! { |a| "#{a}:#{@options[:lines]}" } if @options[:lines]
@@ -365,8 +365,8 @@ def set_dry_run_and_duration
         @options[:duration] = false
       end
 
-      def show_help
-        @out_stream.puts opts.help
+      def show_help(text)
+        @out_stream.puts text
         Kernel.exit(0)
       end