Scaling for vertical axis in more user friendly way

[ambipur76]

Hallo DASPRiD,

 as you can see in the example image, the labels near the vertical axes are the following: 10, 19, 29, 38, 48, 57, 67, 76 MBytes and so on.

 Could you improve this in a way to display 10, 20, 30, 40, 50, 60, 70, 80 MBytes? I mean ticks should be 1, 5 or 10, depending on the maximum value?

[DASPRiD]

Feel free to open a pull request.