Update mirror status

manifest.json

@@ -9,6 +9,10 @@
     "val.7z": {
       "size": 889151115,
       "sha256": "4b443b5a94e3f812644c6f08938e42025f3a41160c88bb5bc57ac73ddf22ff66"
+    },
+    "train.7z": {
+      "size": 2110058115,
+      "sha256": "57eafb3bc2d7402d617aecbd11471d4b0d0f796c75c44c63ca89883f7667c13f"
     }
   }
 }