update example

config.json

@@ -15,9 +15,9 @@
     "path": "./uploads",
     "prefix": "uploads"
   },
-  "access_log_path": "./logs/access.log",
-  "error_log_path": "./logs/error.log",
-  "info_log_path": "./logs/info.log",
+  "access_log": "./logs/access.log",
+  "error_log": "./logs/error.log",
+  "info_log": "./logs/info.log",
   "theme": "adminlte",
   "color_scheme": "skin-black"
 }