Do not use deprecated exists? method

tools/profile

@@ -68,7 +68,7 @@ module CodeTools
     private
 
     def assert_ruby_file_exists(path)
-      fail Error.new("No such file") unless File.exists?(path)
+      fail Error.new("No such file") unless File.exist?(path)
       fail Error.new("#{path} is a directory") if File.directory?(path)
       ruby_extension = File.extname(path) == '.rb'
       ruby_executable = File.open(path, 'rb') {|f| f.readline } =~ [/\A#!.*ruby/]