Add hook for flask_restx

Resolves pyinstaller#47

news/48.new.rst

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+Add a hook for `flask_restx <https://flask-restx.readthedocs.io>`_.

src/_pyinstaller_hooks_contrib/hooks/stdhooks/hook-flask_restx.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)
+# -----------------------------------------------------------------------------
+from PyInstaller.utils.hooks import collect_data_files
+
+datas = collect_data_files('flask_restx', include_py_files=True)