Remove redundant encoding comments

Gemfile

@@ -1,5 +1,3 @@
-# encoding: utf-8
-
 source 'https://rubygems.org'
 
 gemspec name: 'mutant'

Rakefile

@@ -1,5 +1,3 @@
-# encoding: utf-8
-
 require 'devtools'
 
 Devtools.init_rake_tasks

meta/begin.rb

@@ -12,8 +12,6 @@ Mutant::Meta::Example.add do
   mutation 'false'
 end
 
-# encoding: utf-8
-
 Mutant::Meta::Example.add do
 
   source s(:begin, s(:true))

mutant-rspec.gemspec

@@ -1,5 +1,3 @@
-# encoding: utf-8
-#
 require File.expand_path('../lib/mutant/version', __FILE__)
 
 Gem::Specification.new do |gem|

mutant.gemspec

@@ -1,5 +1,3 @@
-# encoding: utf-8
-#
 require File.expand_path('../lib/mutant/version', __FILE__)
 
 Gem::Specification.new do |gem|

test_app/spec/unit/test_app/literal_spec.rb

@@ -1,5 +1,3 @@
-# encoding: utf-8
-
 require 'spec_helper'
 
 RSpec.describe TestApp::Literal do