Gemfile in cistern-2.3.0 vs Gemfile in cistern-2.4.0

@@ -1,9 +1,11 @@
 source "https://rubygems.org"
 
 # Specify your gem"s dependencies in cistern.gemspec
 gemspec
 
+gem "appraisal"
+
 group :test do
   gem "guard-rspec", "~> 4.2", require: false
   gem "guard-bundler", "~> 2.0", require: false
   gem "pry-nav"
   gem "rake"