fix: version number

Update README.md

Fixed status badges

build: deprecate python 3.6 and 3.7

bump pytest -> v8
bump nox -> v2024
bump flake8 -> v7

Update ci-pipeline actions and use caching

Merge pull request #14 from SevanSSP/fix/bad_command_handling_in_cli

Fixed inconsistency between CLI and distribution of commands in work directories

Merge pull request #7 from SevanSSP/bug/argparse-type

Corrects wrong type associated with command line parameter -p and --processes

Updates README with correct header and build status badge.