Fix div by zero error #89
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In floating point arithmetics, we often avoid div by zero errors by rewriting
c = a / btoc = a / (b + eps)with, e.g.,eps = 1.0e-15. This PR suggest a similar fix to avoid div by zero ensuring that the divizor is never zero in https://github.com/willirath/xhistogram/blob/2b6130da9eb35a9fe9f72ec723cfc9971ce228e8/xhistogram/core.py#L115-L117Most of the CI appears to fail which is due to outdated Python versions, I think.