Hi @mateuszz0000

I don't understand why Travis-CI is failing, barely changed the code. Any clue?

pluggy.manager.PluginValidationError: Plugin 'pytest_cov' could not be loaded: (pytest 4.3.1 (/home/travis/virtualenv/python3.7.1/lib/python3.7/site-packages), Requirement.parse('pytest>=4.6'))!
The command "pytest --cov=opensquat --cov=tests --cov=docs/src --cov-report=term-missing tests"

When I run the code I always receive a Killed: 9 error. I believe this is most likely occurring because the kernel kills it because the script consumes too much of memory on my machine. Yet I have 16 GB of RAM.

It looks like a great tool! I hope to get it running on a different system.