Change from double to single quotes

hyperspec.gemspec

@@ -1,33 +1,33 @@
 # -*- encoding: utf-8 -*-
-$:.push File.expand_path("../lib", __FILE__)
-require "hyperspec/version"
+$:.push File.expand_path('../lib', __FILE__)
+require 'hyperspec/version'
 
 Gem::Specification.new do |s|
-  s.name     = "hyperspec"
+  s.name     = 'hyperspec'
   s.version  = HyperSpec::VERSION
-  s.authors  = [ "Hannes Tydén" ]
-  s.email    = [ "hannes@tyden.name" ]
-  s.homepage = "http://github.com/hannestyden/hyperspec"
-  s.summary  = "Full stack HTTP API testing DSL."
+  s.authors  = [ 'Hannes Tydén' ]
+  s.email    = [ 'hannes@tyden.name' ]
+  s.homepage = 'http://github.com/hannestyden/hyperspec'
+  s.summary  = 'Full stack HTTP API testing DSL.'
 
   s.description = <<-DESCRIPTION
     By extending minitest/spec HyperSpec provides a Ruby DSL for testing
     HTTP APIs from the "outside".
   DESCRIPTION
 
   # Required for validation.
-  s.rubyforge_project = "hyperspec"
+  s.rubyforge_project = 'hyperspec'
 
   s.files      = `git ls-files`.split("\n")
   s.test_files = `git ls-files -- {test,spec,features}/*`.split("\n")
 
   s.executables = `git ls-files -- bin/*`.
     split("\n").map { |f| File.basename(f) }
 
-  s.require_paths = [ "lib" ]
+  s.require_paths = [ 'lib' ]
 
-  s.add_dependency("minitest", "~> 2.11")
+  s.add_dependency('minitest', '~> 2.11')
 
-  s.add_development_dependency("vcr", "~> 1.6")
-  s.add_development_dependency("fakeweb")
+  s.add_development_dependency('vcr', '~> 1.6')
+  s.add_development_dependency('fakeweb')
 end