ifcopenshell.util.mvd_info - fix breaking Python 3.9 support (cbe8fc1)

due to `|` operator used in annotations instead of `Union`

src/ifcopenshell-python/ifcopenshell/util/mvd_info.py

@@ -1,3 +1,23 @@
+# IfcOpenShell - IFC toolkit and geometry engine
+# Copyright (C) 2022 Dion Moult <dion@thinkmoult.com>
+#
+# This file is part of IfcOpenShell.
+#
+# IfcOpenShell is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# IfcOpenShell is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with IfcOpenShell.  If not, see <http://www.gnu.org/licenses/>.
+
+from __future__ import annotations
+
 try:
     from lark import Lark, Transformer
     from lark.exceptions import UnexpectedCharacters, UnexpectedEOF, UnexpectedToken