Samples explicitly set the encoding

samples/layouts.rb

@@ -1,3 +1,4 @@
+# encoding: utf-8
 require 'squib'
 
 Squib::Deck.new(layout: 'custom-layout.yml') do

samples/text_options.rb

@@ -1,4 +1,5 @@
 #!/usr/bin/env ruby
+# encoding: utf-8
 require 'squib'
 
 data = {'name' => ['Thief', 'Grifter', 'Mastermind'],