use new syntax for key

.drone.yml

@@ -17,10 +17,11 @@ steps:
 
     - name: deploy
       image: drillster/drone-rsync
-      secrets: [ rsync_key ]
       settings:
           hosts: [ "rezept-schneider.de" ]
           target: /var/www/html/rezeptschneider/public/
           source: public/drone-generated/
           user: deploy-rezept
+          key:
+              from_secret: rsync_key