Rakefile in jekyll-diagrams-0.4.2 vs Rakefile in jekyll-diagrams-0.5.0

@@ -1,10 +1,10 @@
-require "bundler/gem_tasks"
+require 'bundler/gem_tasks'
 require "rake/testtask"
 
 Rake::TestTask.new(:test) do |t|
-  t.libs << "test"
-  t.libs << "lib"
+  t.libs << 'test'
+  t.libs << 'lib'
   t.test_files = FileList['test/**/*_test.rb']
 end
 
 task default: :test