Is Guava 18 required?

[unitydynamics]

I seem to be getting errors when running with Guava 21.

java.lang.NoSuchMethodError: com.google.common.util.concurrent.Futures.transform(...

update to answer my own question yes it seems this works specifically with Guava 18. Not a big deal for me but might consider moving it forward if you can. Thank you for making this library... I will report errors if I run into them. It's crazy that Google doesn't have an answer for asynchronous datastore writing.

[alanw]

Thanks for the heads-up Robert.

I've bumped the Guava dependency and fixed the incompatibilities.