[RuboCop] Single quotes

lib/cocoapods/generator/module_map.rb

@@ -42,7 +42,7 @@ module Pod
       # @return [String]
       #
       def generate
-        module_declaration_qualifier = target.requires_frameworks? ? "framework " : ""
+        module_declaration_qualifier = target.requires_frameworks? ? 'framework ' : ''
         result = <<-eos.strip_heredoc
           #{module_declaration_qualifier}module #{target.product_module_name} {
             umbrella header "#{target.umbrella_header_path.basename}"

lib/cocoapods/installer/target_installer/pod_target_installer.rb

@@ -192,7 +192,7 @@ module Pod
       def link_module_map
         return if target.requires_frameworks? && target.should_build?
 
-        sandbox.public_headers.add_file(target.name, target.module_map_path, "module.modulemap", target.platform)
+        sandbox.public_headers.add_file(target.name, target.module_map_path, 'module.modulemap', target.platform)
       end
 
       # Links a an umbrella header to Public headers.

spec/unit/installer/target_installer/pod_target_installer_spec.rb

@@ -325,7 +325,6 @@ module Pod
           settings['DYLIB_COMPATIBILITY_VERSION'].should == '0.1.2'
         end
       end
-
     end
   end
 end