Merge pull request #50 from simonw/patch-1

Add 'DeveloperContent' to __all__

Author: scott-oai

python/openai_harmony/__init__.py

@@ -708,6 +708,7 @@ def __str__(self) -> str:  # noqa: D401
     "Author",
     "Content",
     "TextContent",
+    "DeveloperContent",
     "ToolDescription",
     "SystemContent",
     "Message",