zero y-axes

[PatMyron]

Would love more visual senses of scale with zeroed y-axes if feasible, thanks!

[TkTech]

Support for controlling the axis would need to be added to https://github.com/ionelmc/pytest-benchmark, as it doesn't seem to expose any configuration for it at the moment. I'm gonna close this for now, but feel free to re-open if there's a reasonable alternative.

I imagine for a lot of the micro-benchmarks these are used for, forcing a non-log scale would make them unreadable.

[PatMyron]

thanks for replying quick, opened ionelmc/pytest-benchmark#274