old_contents: Meteor.startup(function () {
    Singleton.update({}, {$set: { version: "v1.2.2.1" }});
    process.env.MAIL_URL = Meteor.settings.MAIL_URL;
  });
  
new_contents: Meteor.startup(function () {
    Singleton.update({}, {$set: { version: "v1.2.2.2" }});
    process.env.MAIL_URL = Meteor.settings.MAIL_URL;
  });
  
subject: bump version number to v1.2.2.2