update postprocessor entries in example config

- use whitelists
- add ugoira example (#299)

docs/gallery-dl-example.conf

@@ -5,6 +5,20 @@
         "archive": "~/gallery-dl/archive.sqlite3",
         "proxy": "http://10.10.1.10:3128",
 
+        "postprocessors": [
+            {
+                "name": "ugoira",
+                "whitelist": ["pixiv", "danbooru"],
+                "ffmpeg-twopass": true,
+                "ffmpeg-args": ["-c:v", "libvpx", "-crf", "4", "-b:v", "5000k", "-an"]
+            },
+            {
+                "name": "metadata",
+                "whitelist": ["danbooru", "yandere", "sankaku"],
+                "mode": "tags"
+            }
+        ],
+
         "pixiv":
         {
             "archive": "~/gallery-dl/archive-pixiv.sqlite3",
@@ -15,26 +29,6 @@
             "username": "foo",
             "password": "bar",
 
-            "postprocessors": [
-                {
-                    "name": "classify",
-                    "mapping": {
-                        "images": ["jpg", "png", "gif"],
-                        "ugoira": ["zip", "txt"]
-                    }
-                },
-                {
-                    "name": "zip",
-                    "keep-files": true,
-                    "compression": "store"
-                },
-                {
-                    "name": "exec",
-                    "async": false,
-                    "command": ["echo", "\n{user[account]} - {id}"]
-                }
-            ],
-
             "favorite":
             {
                 "directory": ["Pixiv", "Favorites", "{user[id]}"]