Add hook for parsedatetime (#11)

news/11.new.rst

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+Add a hook for ``parsedatetime``, which has hidden imports.

src/_pyinstaller_hooks_contrib/hooks/stdhooks/hook-parsedatetime.py

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+#-----------------------------------------------------------------------------
+# Copyright (c) 2005-2020, PyInstaller Development Team.
+#
+# Distributed under the terms of the GNU General Public License (version 2
+# or later) with exception for distributing the bootloader.
+#
+# The full license is in the file COPYING.txt, distributed with this software.
+#
+# SPDX-License-Identifier: (GPL-2.0-or-later WITH Bootloader-exception)
+#-----------------------------------------------------------------------------
+
+"""
+Fixes https://github.com/pyinstaller/pyinstaller/issues/4995
+
+Modules under parsedatetime.pdt_locales.* are lazily loaded using __import__.
+But they are conviniently listed in parsedatetime.pdt_locales.locales.
+
+Tested on versions:
+
+- 1.1.1
+- 1.5
+- 2.0
+- 2.6 (latest)
+
+"""
+
+from PyInstaller.utils.hooks import collect_submodules
+
+hiddenimports = collect_submodules("parsedatetime.pdt_locales")