Bug#926187: dh-python: dh_python3 replaces shebang with /usr/bin/python2 not /usr/bin/python3

[Drew Parsons]

Package: dh-python
Version: 3.20190308
Followup-For: Bug #926187

To clarify, I meant that dh_python3 replaces the shebangs with
/usr/bin/python2 (not /usr/bin/python) instead of /usr/bin/python3.