Gemfile in dry-configurable-0.3.0 vs Gemfile in dry-configurable-0.4.0

@@ -1,10 +1,13 @@
 source 'https://rubygems.org'
 
 gemspec
 
 group :test do
-  gem 'codeclimate-test-reporter', platform: :rbx
+  platforms :mri do
+    gem 'codeclimate-test-reporter', require: false
+    gem 'simplecov', require: false
+  end
 end
 
 group :tools do
   gem 'guard'
   gem 'guard-rspec'