Gemfile in rbpdf-1.19.0 vs Gemfile in rbpdf-1.19.1

@@ -1,4 +1,8 @@
+# Copyright (c) 2011-2017 NAITOH Jun
+# Released under the MIT license
+# http://www.opensource.org/licenses/MIT
+
 source 'https://rubygems.org'
 
 # Specify your gem's dependencies in rbpdf.gemspec
 gemspec