Update extra requirements (dependencies) in setup.py

Currently, there are versions which are outdated.

    extras_require={
        'devel': [
            'l18n==2018.5',
            'pycountry==18.12.8',
            'pytest==3.7.1',
            'pycodestyle==2.5.0',
            'pylint==2.3.1',
            'pylint-quotes==0.2.1',
            'foris-client @ git+https://gitlab.nic.cz/turris/foris-controller/foris-client@master#egg=foris-client',
            'paho-mqtt==1.5.0',
        ],
        'build': [
            'Sphinx==2.1.2',
            'sphinxcontrib-httpdomain==1.7.0',
        ],
    },

Can you please update them and check if it works for you?

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