pre-commit application is not available

I just git cloned the https://github.com/dwyl/elixir-auth-github project and ran `mix deps.get` followed by `mix test` and got the following warning/error:


```
You have configured application :pre_commit in your configuration file,
but the application is not available.

This usually means one of:

1. You have not added the application as a dependency in a mix.exs file.

2. You are configuring an application that does not really exist.

Please ensure :pre_commit exists or remove the configuration.
```

We may need to add additional setup instructions to this project. 💭

Start by reproducing the reported `mix deps.get` followed by `mix test` commands in a fresh clone, then inspect the project configuration for the `:pre_commit` application and the relevant setup instructions. Done means the warning is resolved or the required setup is clearly documented for new users.

Written by the indexing model from the issue text.