BUG: No version exists that can be used with Python 3.5 and Python 3.8
Since the codebase started using f-strings around version 1.0.0, the only latest version that can be used with Python 3.5 is 0.25.3.

On the other hand, if another package specified dependency as `pandas==0.25.3`, PyPI will not have a pre-compiled Wheel for that (only source distribution). However, compiling those sources fails with modern GCC / CLang and Python 3.8.

Our code must support Python 3.5 because that's what in most currently supported Linux distributions. (eg. Ubuntu 16 LTE). And will have to, at least for a few years.

---

As an aside, I believe f-strings to be a horrible idea, but I cannot force my opinions on you... I'd still wish there was a way to at least remove them from `setup.py`, so that I could install the package using old version of Python (and, hope that I won't hit the code path that uses f-strings when using the library).