Siti

* Update release script.

* Python 3.8.

* Rename changelog.

* Update release script.

* Update requirements instructions.

Requirements are installed via pip anyway

* Update README.

fix info about output format

* Update release script.

* Add manifest.

* Add release script.

* Fix README for usage.

* Update to version 1.0.

This is a major release with fixes for incorrect values read from files.

Thanks to Henrique Domingues Garcia for the PR on
Telecommunication-Telemedia-Assessment/SITI which lets us now calculate the
correct values, at least between those implementations.

* Add pypi badge.