change some config keys

directory_fmt     -> directory
filename_fmt      -> filename
download-original -> original

gallery-dl.conf

@@ -1,16 +1,20 @@
 {
     "base-directory": "/tmp/",
+    "cache":
+    {
+        "file": "/tmp/.gallery-dl.cache"
+    },
     "extractor":
     {
         "pixiv":
         {
             "user":
             {
-                "directory_fmt": ["{category}", "{artist-id}"]
+                "directory": ["{category}", "{artist-id}"]
             },
             "bookmark":
             {
-                "directory_fmt": ["{category}", "my bookmarks"]
+                "directory": ["{category}", "my bookmarks"]
             },
             "ugoira": true,
             "username": null,
@@ -25,7 +29,7 @@
         {
             "wait-min": 3,
             "wait-max": 6,
-            "download-original": true,
+            "original": true,
             "username": null,
             "password": null
         },
@@ -41,7 +45,7 @@
         },
         "gelbooru":
         {
-            "filename_fmt": "{category}_{id:>07}_{md5}.{extension}"
+            "filename": "{category}_{id:>07}_{md5}.{extension}"
         }
     }
 }