Update pluggable-scanners.md (#606)

Trivy also posts DB update timestap

Signed-off-by: Christian Peper <dreamszz@gmail.com>

docs/administration/vulnerability-scanning/pluggable-scanners.md

@@ -34,7 +34,7 @@ To connect Harbor to additional vulnerability scanners, you must install and con
 
 Vulnerability scanners depend on the vulnerability metadata to complete the analysis process. After the first initial installation, the vulnerability scanner automatically starts to update the metadata database from different vulnerability repositories. The database update might take a while, based on the data size and network connection. 
 
-Depending on the scanner that you use, once the database is ready, the timestamp of the last update is shown in the **Interrogation Services** > **Vulnerability** tab. Currently, only Clair and Anchore provide timestamp information.
+Depending on the scanner that you use, once the database is ready, the timestamp of the last update is shown in the **Interrogation Services** > **Vulnerability** tab. Currently, only Trivy, Clair and Anchore provide timestamp information.
 ![browse project](../../../img/clair-ready.png)
 
 Until the database has been fully populated, the timestamp is replaced by a warning symbol. When the database is ready, you can scan images individually or scan all images across all projects.