Bump dependencies to close #37

[mihaimaruseac]

Generated via

[...]$ pip install pip-tools
[...]$ pip install --upgrade ${dependencies}
[...]$ pip freeze > requirements.in
[...]$ pip-compile --allow-unsafe --generate-hashes --output-file=requirements.txt requirements.in

Closes #37, closes #43

[laurentsimon]

Thanks. Feel free to send another PR documenting how the file was generated (for us maintainers)

[mihaimaruseac]

Will include in README.md.