We released WPScan 3.7.0 on September 13th 2019, which uses the WPVulnDB API to fetch vulnerability data in real time. On February 1st 2020, we will be deprecating the use of older versions of WPScan, prior to version 3.7.0.
Anyone using WPScan that is at a version lesser than 3.7.0 will have to update to at least version 3.7.0, or above, before February 1st 2020.