Gemfile in haml-5.1.2 vs Gemfile in haml-5.2.0

@@ -1,19 +1,16 @@
 source "https://rubygems.org"
 gemspec
 
 gem "m"
 gem "pry"
+gem "simplecov"
 
 group :docs do
   gem "yard"
   gem "kramdown"
   gem "sass"
 end
 
 platform :mri do
   gem "ruby-prof"
-end
-
-platform :mri_21 do
-  gem "simplecov"
 end