README: use pip3 instead of pip
Since Ubuntu 20.04 LTS, there is no package python-pip. It is available to install python3-pip and if you would like to try to use pip, it does not work. Because there is just pip3.
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Since Ubuntu 20.04 LTS, there is no package python-pip. It is available to install python3-pip and if you would like to try to use pip, it does not work. Because there is just pip3.