Simplify Gemfile

This doesn't change much, but may make Dependabot not fail anymore.

Author: mvz

Gemfile

@@ -4,23 +4,19 @@ source 'https://rubygems.org'
 
 gemspec
 
-group :development do
-  gem 'aruba',                 '~> 2.1'
-  gem 'codeclimate-engine-rb', '~> 0.4.0'
-  gem 'cucumber',              '~> 9.0'
-  gem 'kramdown',              '~> 2.1'
-  gem 'kramdown-parser-gfm',   '~> 1.0'
-  gem 'rake',                  '~> 13.0'
-  gem 'rspec',                 '~> 3.0'
-  gem 'rspec-benchmark',       '~> 0.6.0'
-  gem 'rubocop',               '~> 1.72.2'
-  gem 'rubocop-performance',   '~> 1.24.0'
-  gem 'rubocop-rspec',         '~> 3.5.0'
-  gem 'simplecov',             '~> 0.22.0'
-  gem 'yard',                  '~> 0.9.5'
+gem 'aruba',                 '~> 2.1'
+gem 'codeclimate-engine-rb', '~> 0.4.0'
+gem 'cucumber',              '~> 9.0'
+gem 'kramdown',              '~> 2.1'
+gem 'kramdown-parser-gfm',   '~> 1.0'
+gem 'rake',                  '~> 13.0'
+gem 'rspec',                 '~> 3.0'
+gem 'rspec-benchmark',       '~> 0.6.0'
+gem 'rubocop',               '~> 1.72.2'
+gem 'rubocop-performance',   '~> 1.24.0'
+gem 'rubocop-rspec',         '~> 3.5.0'
+gem 'simplecov',             '~> 0.22.0'
+gem 'yard',                  '~> 0.9.5'
 
-  platforms :mri do
-    # Needed for YARD to properly parse GFM code blocks in the documentation
-    gem 'redcarpet', '~> 3.4'
-  end
-end
+# Needed for YARD to properly parse GFM code blocks in the documentation
+gem 'redcarpet', '~> 3.4', platform: :mri