Extend exported public interface

These were always meant to be public. Eases users importing e.g. the common return type `ExtractResult`.

Author: john-kurkowski

tldextract/__init__.py

@@ -1,12 +1,14 @@
 """Export tldextract's public interface."""
 
 from . import _version
-from .tldextract import TLDExtract, extract
+from .tldextract import ExtractResult, TLDExtract, extract, update
 
 __version__: str = _version.version
 
 __all__ = [
+    "__version__",
     "extract",
+    "ExtractResult",
     "TLDExtract",
-    "__version__",
+    "update",
 ]