Gemfile in arbre-1.0.3 vs Gemfile in arbre-1.1.1

@@ -1,8 +1,10 @@
 source 'http://rubygems.org'
 
 gemspec
 
+gem 'mime-types', '~> 2.6', platforms: :ruby_19
+
 group :test do
   gem 'rspec'
   gem 'rack'
   gem 'pry'
 end