Merge pull request #7 from ProseGuys/fix_from_dict_bugs

[fix] fix bugs about from_dict function

streamlit_chatbox/messages.py

@@ -248,6 +248,7 @@ def from_dict(
                 msg = {
                     "role": h["role"],
                     "elements": [OutputElement.from_dict(y) for y in h["elements"]],
+                    "metadata": h["metadata"],
                     }
                 self.other_history(name).append(msg)