fix: context field is either a string or a dictionary

Author: ff137

aries_cloudcontroller/model/credential.py

@@ -27,7 +27,7 @@ class Credential(BaseModel):
         proof: The proof of the credential [Optional].
     """
 
-    context: List[Union[str,Dict]] = Field(..., alias="@context")
+    context: List[Union[str, Dict]] = Field(..., alias="@context")
     credential_subject: Dict[str, Any] = Field(..., alias="credentialSubject")
     issuance_date: str = Field(..., alias="issuanceDate")
     issuer: Union[str, Dict[str, Any]]