Remove legacy magic comment

Author: sue445

lib/sample.rb

@@ -1,5 +1,3 @@
-# -*- encoding: utf-8 -*-
-
 class Sample
   def say(greeting)
     "#{greeting} TDD BootCamp!"

spec/lib/sample_spec.rb

@@ -1,5 +1,3 @@
-# -*- encoding: utf-8 -*-
-
 describe Sample do
   let(:sample){ Sample.new }