Fix a typo on using double-quoted strings

Signed-off-by: Mahdi Fooladgar <[email protected]>

Author: professormahi

controls/postgres_spec.rb

@@ -38,7 +38,7 @@
   impact 1.0
   title 'Postgresql should be running'
   desc 'Postgresql should be running.'
-  if os[:name] == "ubuntu"
+  if os[:name] == 'ubuntu'
     describe command('/etc/init.d/postgresql status') do
       its('stdout') { should include 'active' }
     end