minor fix for config class

modeling_git.py

@@ -16,9 +16,12 @@ from transformers.models.opt.modeling_opt import OPTConfig
 import transformers.models.opt.modeling_opt as hg_opt
 import transformers.models.clip.modeling_clip as modeling_clip
 from transformers.modeling_outputs import SequenceClassifierOutputWithPast
+from .configuration_git import GitConfig
 
 
 class GitForCausalLM(modeling_git.GitForCausalLM):
+    config_class = GitConfig
+
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
 
@@ -219,4 +222,4 @@ class GitForSequenceClassification(modeling_git.GitPreTrainedModel):
             past_key_values=outputs.past_key_values,
             hidden_states=outputs.hidden_states,
             attentions=outputs.attentions,
-        )
+        )