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If you can, please switch your non-playground code dependencies to this release version. If you cannot, remember to switch it them to 0.10.0-SNAPSHOTSNAPSHOT as soon as master compiles again.
Any development which is done on v0.9.x should, of course, also be merged into master. The cleanest way to do this is to develop on a personal branch , which is branched off master at some point before today, and, when you're finished, merge that branch into both v0.9.x and master. (Careful: Not the other way round.)
Update: Apparently, there are issues with (I would guess) Bintray's delivery network. Currently, Maven artifacts will sometimes only download on the second attempt, failing some builds. Let's see how this develops.