publish 0.7.5 and 0.8.1 with ArraySerializer fix

[johnynek]

#257 should be ported to the 0.7.x branch (kryo 2.x) which is still required by people who can't change their kryo implementation.

Then we should publish a new version.

/cc @isnotinvain I'm on PTO next week. Can someone at Twitter publish a point release?

[johnynek]

@chermenin

[chermenin]

Well, what's going with it?

[johnynek]

@chermenin https://github.com/twitter/chill/releases/tag/v0.8.1 that is published. 0.7.5 still has to have some merges.