cose.gemspec in cose-0.4.1 vs cose.gemspec in cose-0.5.0

@@ -31,9 +31,10 @@
 
   spec.required_ruby_version = ">= 2.2"
 
   spec.add_dependency "cbor", "~> 0.5.9.2"
 
+  spec.add_development_dependency "appraisal", "~> 2.2.0"
   spec.add_development_dependency "bundler", ">= 1.17", "< 3"
   spec.add_development_dependency "byebug", "~> 11.0"
   spec.add_development_dependency "rake", "~> 12.3"
   spec.add_development_dependency "rspec", "~> 3.8"
   spec.add_development_dependency "rubocop", "0.65.0"