Release 2.0 does not support Python 3.5

[taam]

The code checks for Python 3.5, but that version actually does not work, as the f-strings are used, which require Python 3.6. This effectively drops support for Ubuntu 16.04 (which has reached "end of standard support").

There are only 3 places where f-strings are used, which could be replaced, otherwise the version check should probably test for Python 3.6.