Troubles getting started

Hi there,

I'm trying to get started for the first time with conform. Having some trouble with what I thought would be the easy part! :)

I have an umbrella app - one of the applications inside houses an `ecto` repo. I decided to try to start pulling in conform in that app as it would be easiest to know if something was broken.

I've created `shared_repo.schema.exs` and `shared_repo.dev.conf`. If I use `mix conform.effective`, I see some values I expect:

```elixir
shared_repo: [
{SharedRepo.Repo,
[
adapter: Ecto.Adapters.Postgres,
database: "myapp_dev",
hostname: "localhost",
loggers: [
{Ecto.LogEntry,
:log,
[]}
],
pool_size: 10
]},
{:ecto_repos,
[SharedRepo.Repo]}
]
```

However, when I attempt to boot the app, it blows up as it can't find a `database` key inside the configuration for the repo. I'm a bit confused and don't know what to do next. The app boots fine just using a standard `config.exs` and `config.dev.exs`.

Any help you could provide would be appreciated!