Add scroll margins

[max-sym]

Changes

• Made it so that we can define inside margins for scroll, meaning that the lib would start scrolling before the mouse surpasses the very edges of the container;

Motivation

• I wanted to use it in a rich text editor, the vertical edge of which reached the very bottom of the page, and when I'd put my mouse at the very bottom the container won't scroll. Created this PR to make the user experience more comfortable for bigger containers.

[simonwep]

Sorry for the late reply, I'll give it a review tonight!

[simonwep]

Sorry for taking another week - I'm currently taking a small break. Could you also update the README with the newly added config option?

[max-sym]

@simonwep fixed everything, you can check now! :)

[simonwep]

I just rebased it and squashed the first 3 commits since they're basically "fixes" for themselves ^^

[simonwep]

Thank you for this feature 🎉 Have a nice weekend ^^

[max-sym]

Awesome, thanks have a great weekend you too 🚀🚀🚀

[max-sym]

Hey, @simonwep can this be released? Need it in my project :)

[simonwep]

@MaxChu23 Sorry, will do tomorrow!

[max-sym]

Thanks a lot!!!

[simonwep]

v3.0.0-beta.10 is released :)