rubocop: fix offences of the Style/Encoding cop

.rubocop_todo.yml

@@ -230,13 +230,6 @@ Style/DoubleNegation:
     - 'lib/pry/slop/option.rb'
     - 'lib/pry/wrapped_module.rb'
 
-# Offense count: 2
-# Cop supports --auto-correct.
-Style/Encoding:
-  Exclude:
-    - 'lib/pry/pry_instance.rb'
-    - 'lib/pry/terminal.rb'
-
 # Offense count: 27
 Style/EvalWithLocation:
   Exclude:

lib/pry/pry_instance.rb

@@ -1,5 +1,3 @@
-# -*- coding: utf-8 -*-
-
 ##
 # Pry is a powerful alternative to the standard IRB shell for Ruby. It
 # features syntax highlighting, a flexible plugin architecture, runtime

lib/pry/terminal.rb

@@ -1,5 +1,3 @@
-# coding: utf-8
-
 class Pry
   class Terminal
     class << self