Elixir tests

Update faq.md | changed wording around prepared statements in FAQ #309

Annotations

7 warnings

System.stacktrace/0 is deprecated. Use __STACKTRACE__ instead

Mix.Config.merge/2 is deprecated. Use Config.Reader.merge/2 instead

System.stacktrace/0 is deprecated. Use __STACKTRACE__ instead

Mix.Config.eval!/2 is deprecated. Use Config.Reader.read_imports!/2 instead

Mix.Config.merge/2 is deprecated. Use Config.Reader.merge/2 instead

Mix.Config.persist/1 is deprecated. Use Application.put_all_env/2 instead

use Bitwise is deprecated. import Bitwise instead