Fix issue #11 setting default value for yes?/no? prompts.

lib/tty/prompt.rb

@@ -230,8 +230,9 @@ def invoke_select(object, question, *args, &block)
     #
     # @api public
     def yes?(message, *args, &block)
-      options = Utils.extract_options!(args)
-      options.merge!(default: true)
+      defaults = { suffix: 'Y/n', default: true }
+      options  = Utils.extract_options!(args)
+      options.merge!(defaults.reject { |k, _| options.key?(k) })
 
       question = ConfirmQuestion.new(self, options)
       question.call(message, &block)

spec/unit/yes_no_spec.rb

@@ -41,6 +41,18 @@
       ].join)
     end
 
+    it 'changes default' do
+      prompt.input << "\n"
+      prompt.input.rewind
+      expect(prompt.yes?("Are you a human?", default: false)).to eq(false)
+      expect(prompt.output.string).to eq([
+        "Are you a human? \e[90m(Y/n)\e[0m ",
+        "\e[1000D\e[K\e[1A",
+        "\e[1000D\e[K",
+        "Are you a human? \e[32mNo\e[0m\n"
+      ].join)
+    end
+
     it "customizes question through options" do
       prompt.input << "\r"
       prompt.input.rewind
@@ -112,6 +124,18 @@
       ].join)
     end
 
+    it 'changes default' do
+      prompt.input << "\r"
+      prompt.input.rewind
+      expect(prompt.no?("Are you a human?", default: true)).to eq(false)
+      expect(prompt.output.string).to eq([
+        "Are you a human? \e[90m(y/N)\e[0m ",
+        "\e[1000D\e[K\e[1A",
+        "\e[1000D\e[K",
+        "Are you a human? \e[32mYes\e[0m\n"
+      ].join)
+    end
+
     it "customizes question through DSL" do
       prompt.input << "agree\r"
       prompt.input.rewind