Updated PrivateBin to 1.5.1. Added persistent config volume to allow config override (#958)

public/v4/apps/privatebin.yml

@@ -7,13 +7,14 @@ services:
             PHP_TZ: '$$cap_tz'
         volumes:
             - '$$cap_appname-data:/srv/data'
+            - '$$cap_appname-cfg:/srv/cfg'
         caproverExtra:
             containerHttpPort: '8080'
 caproverOneClickApp:
     variables:
         - id: '$$cap_version'
           label: PrivateBin Version
-          defaultValue: '1.3.4'
+          defaultValue: '1.5.1'
           description: Check out their Docker page for the valid tags https://hub.docker.com/r/privatebin/nginx-fpm-alpine/tags
           validRegex: "/^([^\\s^\\/])+$/"
         - id: '$$cap_tz'