Update dependencies.md to mention jitpack

[doofin]

No description provided.

[MaciejG604]

Hi @doofin, thank you for contributing, that's a valid remark.

I think the information about jitpack would fit much better into the table in the Predefined repositories section of the file you've updated.

Also It would be nice if you rebased your commit onto the stable branch and changed the target branch for this PR so that the website can be updated right away. (more info here)

[Gedochao]

I squashed the 2 commits (please take care about keeping the commit history clean) and rebased it on top of stable (purely docs changes should go straight there, as mentioned).
Please pay attention to those things, it gets PRs merged a lot faster if we don't have to clean it up.
All the guidelines are in CONTRIBUTING.md

Regardless, thanks for the contribution!

[doofin]

thanks @Gedochao for the help! I've been messing around with the rebase and branch switch