Update ExActor

Follow modifications on new ExActor release:

https://github.com/sasa1977/exactor/blob/0e33c1ae9ed9c6dc772c16aa10b98458931b6b83/CHANGELOG.md

I was using `exvcr` on a project and I don't know why mix updated `exactor`. I noticed the deprecations, updated and fixed on `exvcr`.