single quotes for static strings

casein.gemspec

-$:.push File.expand_path("../lib", __FILE__)
+$:.push File.expand_path('../lib', __FILE__)
 
 # Maintain your gem's version:
-require "casein/version"
+require 'casein/version'
 
 # Describe your gem and declare its dependencies:
 Gem::Specification.new do |s|
-  s.name        = "casein"
+  s.name        = 'casein'
   s.version     = Casein::VERSION
-  s.authors     = ["Russell Quinn"]
-  s.date        = "2018-12-19"
-  s.description = "A lightweight CMS toolkit for Ruby on Rails, based on Bootstrap."
-  s.summary     = "A lightweight CMS toolkit for Ruby on Rails, based on Bootstrap."
-  s.email       = ["mail@russellquinn.com"]
-  s.homepage    = "http://www.caseincms.com/"
-  s.license     = "MIT"
+  s.authors     = ['Russell Quinn']
+  s.date        = '2018-12-19'
+  s.description = 'A lightweight CMS toolkit for Ruby on Rails, based on Bootstrap.'
+  s.summary     = 'A lightweight CMS toolkit for Ruby on Rails, based on Bootstrap.'
+  s.email       = ['mail@russellquinn.com']
+  s.homepage    = 'http://www.caseincms.com/'
+  s.license     = 'MIT'
 
-  s.files = Dir["{app,config,db,lib}/**/*", "LICENSE", "Rakefile", "README.rdoc"]
+  s.files = Dir['{app,config,db,lib}/**/*', 'LICENSE', 'Rakefile', 'README.rdoc']
   s.extra_rdoc_files = [
-    "LICENSE",
-    "README.rdoc"
+    'LICENSE',
+    'README.rdoc'
   ]
 
-  s.add_dependency "will_paginate", ">= 3.1.5"
-  s.add_dependency "authlogic", "~> 5.0.0"
-  s.add_dependency "scrypt", ">= 1.2.1"
-  s.add_dependency "bootstrap-sass", "~> 3.4.0"
-  s.add_dependency "sassc-rails", '>= 2.0.0'
-  s.add_dependency "jquery-rails", '>= 0'
+  s.add_dependency 'will_paginate', '>= 3.1.5'
+  s.add_dependency 'authlogic', '~> 5.0.0'
+  s.add_dependency 'scrypt', '>= 1.2.1'
+  s.add_dependency 'bootstrap-sass', '~> 3.4.0'
+  s.add_dependency 'sassc-rails', '>= 2.0.0'
+  s.add_dependency 'jquery-rails', '>= 0'
 
-  s.add_development_dependency "rspec", "~> 3.0"
-  s.add_development_dependency "rspec-rails", ">= 0"
-  s.add_development_dependency "capybara-rails", ">= 0"
-  s.add_development_dependency "capybara", "~> 3.0"
-  s.add_development_dependency "sqlite3", '>= 0'
-end
\ No newline at end of file
+  s.add_development_dependency 'rspec', '~> 3.0'
+  s.add_development_dependency 'rspec-rails', '>= 0'
+  s.add_development_dependency 'capybara-rails', '>= 0'
+  s.add_development_dependency 'capybara', '~> 3.0'
+  s.add_development_dependency 'sqlite3', '>= 0'
+end