Merge branch 'master' into 7-soundex-incorrect-calculation

Merge pull request #8 from linuxgoose/6-rebrand---linguistics-robin

Rebranding

Fixing of not dropping all leading instances of the first character matching the next in line

Rebranding

general updates

* added exception type for empty string
* updated checks in algorithms
* updated tests
* moved to new flit publishing method using pyproject.toml