I need to plot `BarChart` with the error bars. What's the most straightforward way to do it?#plot range from 8 to 10 `{8.5,8.6,8.9,9.5}` and error bars of `0.1` and labeling of `a`, `b`, `c` and `d`.
Is there something like `"ErrorBarPlots`"` package which I can use for `BarChart`?