Add aws invalidation back to update script

Scripts/update_feed.rb

@@ -114,6 +114,9 @@ if 1 #appcast_revision < latest_revision
   #Upload to S3
   %x[s3cmd put -P -m application/xml '#{site_dir}/#{feed}_builds/#{feed}.xml' s3://cogcdn.cog.losno.co]
 
+  # invalidate cache of feed manifest
+  %x[aws cloudfront create-invalidation --distribution-id E2O8QDAIFS424Q --paths "/#{feed}.xml"]
+
   #Send web hook to update site
   update_uri = %x[security find-generic-password -w -a #{ENV['LOGNAME']} -s cogupdateurl]
   %x[curl -X POST #{update_uri}]