What Does This Mean?
If your website doesn't start with https:// your site will display this message to everyone who goes to your website.
“The use of HTTPS is mandated by a number of regulations such as PCI/DSS for credit cards, HIPAA for healthcare information, and others.” Hagen from Google says.
Update Your Site
No Question About If Your Site Needs SSL, Only How Long Do You Have Until Google Penalizes Your Site.