Fix after review

Author: ark-konopacki

lib/run_loop/detect_aut/xcode.rb

@@ -1,10 +1,10 @@
-require 'etc'
 
 module RunLoop
   # @!visibility private
   module DetectAUT
     # @!visibility private
     module Xcode
+      require "etc"
 
       # @!visibility private
       def xcode_project?
@@ -166,8 +166,8 @@ def pbuddy
       # @!visibility private
       def self.detect_selected_device
         file_name = find_user_state_file
-        pbuddy ||= RunLoop::PlistBuddy.new
-        selected_device = pbuddy.plist_find_device(file_name)
+        @pbuddy ||= RunLoop::PlistBuddy.new
+        selected_device = @pbuddy.plist_find_device(file_name)
         if selected_device != '' && !selected_device.nil?
           udid = selected_device.split(':')[1]
           selected_device = RunLoop::Device.device_with_identifier(udid)

lib/run_loop/plist_buddy.rb

@@ -26,7 +26,7 @@ def plist_read(key, file, opts={})
       end
     end
 
-    # !!Experimental!! find device in xcuserstate file.
+    # @!visibility private
     # @param [String] file the plist to read
     # @return [String] the UDID of device
     def plist_find_device(file)