Expose all names in root package. Ref #58.

Author: jaraco

importlib_metadata/__init__.py

@@ -1,19 +1,22 @@
-from .api import distribution, Distribution, PackageNotFoundError  # noqa: F401
 from .api import (
-    metadata, entry_points, version, files, requires, distributions,
+    distribution, Distribution, distributions, entry_points, files,
+    metadata, PackageNotFoundError, requires, version,
     )
 
 # Import for installation side-effects.
 from . import _hooks  # noqa: F401
 
 
 __all__ = [
+    'distribution',
+    'Distribution',
+    'distributions',
     'entry_points',
     'files',
     'metadata',
+    'PackageNotFoundError',
     'requires',
     'version',
-    'distributions',
     ]