[Security] Bump tensorflow from 1.12.0 to 1.13.1 (#79)

* Bump tensorflow from 1.12.0 to 1.13.1

Bumps [tensorflow](https://github.com/tensorflow/tensorflow) from 1.12.0 to 1.13.1.
- [Release notes](https://github.com/tensorflow/tensorflow/releases)
- [Changelog](https://github.com/tensorflow/tensorflow/blob/master/RELEASE.md)
- [Commits](https://github.com/tensorflow/tensorflow/compare/v1.12.0...v1.13.1

)

Signed-off-by: dependabot[bot] <support@dependabot.com>

* disables two pylint warnings after security upgrade to tensorflow 1.13.1

* dropped 'futures' version requirement for python3