Updating flickity peerDependency and devDependency to 3.0.0

[haase1020]

Currently the version of flickity used for this repository is 2.2.1. I installed flickity version 2.3.0 as recommended in the README, but I also use flickity-as-nav-for and flickity-fade packages that are now updated to flickity version 3.0.0. I would like to update my repository to flickity 3.0.0, but when I do so I get a warning that [email protected]" has incorrect peer dependency "flickity@^2.2.1". If I use flickity version 2.3.0 however, I cannot update flickity-as-nav-for and flickity-fade to their latest versions.

If this repository could be updated to use flickity version 3.0.0 that would be great!

[yaodingyd]

Until 3.0 is stable, we will hold off upgrading to it. metafizzy/flickity#1210 (comment)