Bump patch version to silence Elixir 1.4 warnings

While mix test seems to work just fine using Elixir 1.4, it spits out
a bunch of warnings for zero-arity function calls (cf.
https://github.com/elixir-lang/elixir/issues/3268).

This was fixed by #2. Those changes are still compatible with Elixir
1.3, so no need for a major version bump. But Elixir 1.4 users probably
don't appreciate all these warnings.