style(rubocop): fix all safe auto correctable offenses

lib/tasks/postal.rake

@@ -1,25 +1,27 @@
 namespace :postal do
-
   desc "Start the cron worker"
-  task :cron => :environment do
-    require 'clockwork'
-    require Rails.root.join('config', 'cron')
-    trap('TERM') { puts "Exiting..."; Process.exit(0) }
+  task cron: :environment do
+    require "clockwork"
+    require Rails.root.join("config", "cron")
+    trap("TERM") do
+      puts "Exiting..."
+      Process.exit(0)
+    end
     Clockwork.run
   end
 
-  desc 'Start SMTP Server'
-  task :smtp_server => :environment do
-    Postal::SMTPServer::Server.new(:debug => true).run
+  desc "Start SMTP Server"
+  task smtp_server: :environment do
+    Postal::SMTPServer::Server.new(debug: true).run
   end
 
-  desc 'Start the message requeuer'
-  task :requeuer => :environment do
+  desc "Start the message requeuer"
+  task requeuer: :environment do
     Postal::MessageRequeuer.new.run
   end
 
-  desc 'Run all migrations on message databases'
-  task :migrate_message_databases => :environment do
+  desc "Run all migrations on message databases"
+  task migrate_message_databases: :environment do
     Server.all.each do |server|
       puts "\e[35m-------------------------------------------------------------------\e[0m"
       puts "\e[35m#{server.id}: #{server.name} (#{server.permalink})\e[0m"
@@ -27,9 +29,8 @@ namespace :postal do
       server.message_db.provisioner.migrate
     end
   end
-
 end
 
-Rake::Task['db:migrate'].enhance do
-  Rake::Task['postal:migrate_message_databases'].invoke
+Rake::Task["db:migrate"].enhance do
+  Rake::Task["postal:migrate_message_databases"].invoke
 end