Tensorpy

Update a Python dependency:
* ``beautifulsoup4==4.9.2``

Update Python dependencies


tensorflow==1.15.4
pip>=20.2.3
six>=1.15.0
requests>=2.24.0
Pillow==7.2.0
beautifulsoup4==4.9.1


Reminder:``tensorpy`` has strict OS and Python requirements:

* <b>A Mac or Linux machine</b>
* <b>Python 3.5, 3.6, or 3.7</b>

Bring back ``tensorpy``

For awhile, ``tensorpy`` stopped working due to changes in ``tensorflow``.
Thanks to the release of https://pypi.org/project/tensorflow/1.15.4/, the following tensorflow issues / security vulnerabilities have been patched:
* https://github.com/tensorflow/tensorflow/security/advisories/GHSA-cvpc-8phh-8f45
* https://github.com/tensorflow/tensorflow/security/advisories/GHSA-63xm-rx5p-xvqr

New ``tensorpy`` Python requirements:


tensorflow==1.15.4
six>=1.11.0
requests>=2.18.4
Pillow==5.4.1
BeautifulSoup4>=4.6.0


``tensorpy`` now has strict OS and Python requirements:

* <b>A Mac or Linux machine</b>
* <b>Python 3.5, 3.6, or 3.7</b>

Use tensorflow==1.14.0

Requirements update:
* Use Pillow>=6.1.0

Fix tensorpy