add whenever and make rake for dns update

lib/tasks/dns.rake

@@ -0,0 +1,9 @@
+namespace :dns do
+  desc "Update own dyn dns records"
+  task update: :environment do
+    job = DnsUpdateJob.new
+    puts "My ip is #{job.my_ip}"
+    job.update_ip("gateway" , "hubfeenix.fi")
+  end
+
+end