change model_type to blip-2 (#1)

- change model_type to blip-2 (30cbf9f0ee78d060ce1bfc7cb31fe325158e069e)

config.json

@@ -5,7 +5,7 @@
   "image_text_hidden_size": 256,
   "initializer_factor": 1.0,
   "initializer_range": 0.02,
-  "model_type": "blip-2-without-lm",
+  "model_type": "blip-2",
   "num_query_tokens": 32,
   "qformer_config": {
     "model_type": "blip_2_qformer",