Gemfile in usable-1.2.0 vs Gemfile in usable-1.2.1

@@ -1,7 +1,10 @@
 source 'https://rubygems.org'
 
 # Specify your gem's dependencies in usable.gemspec
 gemspec
 
-gem 'object_tracker'
-gem 'byebug'
+if RUBY_VERSION >= '2.0'
+  # gem 'object_tracker'
+  gem 'byebug'
+end
+