Add vat alias so stdnum.vatin works for the United States

unho · unho · commit 7408ae4af614 · 2022-09-10T17:48:35.000+02:00
While stdnum provides several modules implementing some sort of TIN for the
United States, EIN is the only only used for companies and institutions.
diff --git a/stdnum/us/__init__.py b/stdnum/us/__init__.py
@@ -19,3 +19,6 @@
 # 02110-1301 USA
 
 """Collection of United States numbers."""
+
+# provide aliases
+from stdnum.us import ein as vat  # noqa: F401
