Bump patch version to fix Mix 1.9 errors

As noted in #12, #14, #15, #16, #17, and even way back in a comment on
a5fb55b48b999dda97aa493917e9317c4721b654, my prior inclination to try to
use :included_applications and :applications separately was
ill-fated. Under Elixir 1.9.0, Mix started blowing up properly on `mix
release` with

• (Mix) :combine is listed both as a regular application and as an included application

So I guess everything should go under :applications by design. /shrug

I'm trusting this to be backwards-compatible with Elixir 1.3, per the
discussions on #1 from way back when. 😅