chore(python): include py.typed files in release (#145)

A py.typed file must be included in the released package for it to be considered typed by type checkers. https://www.python.org/dev/peps/pep-0561/#packaging-type-information. See https://github.com/googleapis/python-secret-manager/issues/79

Source-Author: Bu Sun Kim <[email protected]>
Source-Date: Fri Feb 5 17:32:06 2021 -0700
Source-Repo: googleapis/synthtool
Source-Sha: 33366574ffb9e11737b3547eb6f020ecae0536e8
Source-Link: https://github.com/googleapis/synthtool/commit/33366574ffb9e11737b3547eb6f020ecae0536e8
2 files changed