Suggestion: Change y limits of learning curves in README

[RylanSchaeffer]

If I can make one small quick suggestion, perhaps the two following plots in your README should have the same y axis limits.

[RylanSchaeffer]

To explain why, when I first saw the plots, the bottom figure (without the imbalanced sampler) looks to rise faster. But then I noticed the y limits were different and the top figure (with the imbalanced sampler) was higher.