Gemfile in plucky-0.7.0 vs Gemfile in plucky-0.8.0

@@ -1,17 +1,18 @@
 source 'https://rubygems.org'
 gemspec
 
-gem 'bson_ext', '~> 1.5', :platform => :mri
 gem 'rake'
 
-group :performance  do
-  gem 'perftools.rb', :require => 'perftools', :platform => :mri
-end
-
 group(:test) do
   gem 'rspec'
   gem 'log_buddy'
+
+  if RUBY_ENGINE == "ruby" && RUBY_VERSION >= '2.3'
+    platforms :mri do
+      gem 'byebug'
+    end
+  end
 end
 
 group(:guard) do
   gem 'guard'
   gem 'guard-rspec'