`Ignoring an undefined check` when running with credo

[RossHammer]

I am having trouble getting the Credo check working, with the error Ignoring an undefined check: ExcellentMigrations.CredoCheck.MigrationsSafety.
Whenever I run credo it doesn't seem to want to run the migration checks. Here what I get after setting it up in a new phoenix project with my credo config. To fix the errors if I explicitly put the excellent_migrations files into the requires block everything seems to work. I'm sure this is something I'm doing wrong but I can't see what it is.

>mix deps.get
(snipped)
>mix compile
(snipped)
>mix credo                                                                                                                                                     646ms 2 ✖
** (config) Ignoring an undefined check: ExcellentMigrations.CredoCheck.MigrationsSafety
Checking 27 source files ...

Please report incorrect results: https://github.com/rrrene/credo/issues

Analysis took 0.1 seconds (0.03s to load, 0.1s running 55 checks on 27 files)
64 mods/funs, found no issues.

Showing priority issues: ↑ ↗ →  (use `mix credo explain` to explain issues, `mix credo --help` for options).

I added mix deps like so

{:credo, "~> 1.7", only: [:dev, :test], runtime: false},
{:excellent_migrations, "~> 0.1", only: [:dev, :test], runtime: false}

with this .credo.exs config

%{
  configs: [
    %{
      name: "default",
      files: %{
        included: [
          "config/",
          "lib/",
          "priv/",
          "test/"
        ],
        excluded: [~r"/_build/", ~r"/deps/", ~r"/node_modules/"]
      },
      checks: [
        {ExcellentMigrations.CredoCheck.MigrationsSafety, []}
      ],
      plugins: [],
      requires: [
        # Adding these fixes the issue
        # "deps/excellent_migrations/lib/dangers_filter.ex",
        # "deps/excellent_migrations/lib/config_comments_parser.ex",
        # "deps/excellent_migrations/lib/ast_parser_full_detections.ex",
        # "deps/excellent_migrations/lib/ast_parser.ex",
        # "deps/excellent_migrations/lib/files_finder.ex",
        # "deps/excellent_migrations/lib/message_generator.ex",
        # "deps/excellent_migrations/lib/dangers_detector.ex",
        # "deps/excellent_migrations/lib/credo_check/migrations_safety.ex"
      ],
      strict: false,
      parse_timeout: 5000,
      color: true
    }
  ]
}