Feature Suggestion: Minimal Log Axis Showing Only Powers of 10

Hi

I needed a clean log axis that only showed powers of 10 and I couldn't find anything in the documentation so I modified the yAxis tick callback so that it only returned powers of 10.

Here is a description of my original problem.

https://stackoverflow.com/a/50971764/7384648

Here is a CodePen example showing my solution.

https://codepen.io/LondonWebFactory/pen/jKzdev

Is this something that is worth documenting or even a feature that could be built into the core options?

What do you think?