Add im_end to eos

Maybe can help those im_end at the end of response.

config.json

@@ -5,7 +5,7 @@
   ],
   "attention_dropout": 0.0,
   "bos_token_id": 1,
-  "eos_token_id": 2,
+  "eos_token_id": [2, 15],
   "head_dim": 128,
   "hidden_act": "silu",
   "hidden_size": 5120,