Go back to double quotes and put each version on its own line

Appraisals

@@ -1,11 +1,17 @@
-{ '5_2' => '5.2.0', '6_0' => '6.0.0', '6_1' => '6.1.0', '7_0' => '7.0.0', '7_1' => '7.1.0',
-  '7_2' => '7.2.0' }.each do |rails, version|
+{
+  "5_2" => "5.2.0",
+  "6_0" => "6.0.0",
+  "6_1" => "6.1.0",
+  "7_0" => "7.0.0",
+  "7_1" => "7.1.0",
+  "7_2" => "7.2.0"
+}.each do |rails, version|
   appraise "rails-#{rails}" do
-    gem 'rails', "~> #{version}"
+    gem "rails", "~> #{version}"
   end
 end
 
-appraise 'rails-main' do
-  gem 'rails', github: 'rails/rails', branch: 'main'
-  gem 'rspec-rails', '~> 6.0.2'
+appraise "rails-main" do
+  gem "rails", github: "rails/rails", branch: "main"
+  gem "rspec-rails", "~> 6.1"
 end