Include complete path to the AppConfig in README

This is now the preferred way:
https://docs.djangoproject.com/en/2.2/ref/applications/

README.md

@@ -21,7 +21,8 @@ django-admin startproject PROJECT_NAME
 ln -sr bam PROJECT_DIRECTORY/bam
 ```
 
-  4. Add `bam` to `INSTALLED_APPS` in the project's `settings.py`.
+  4. Add `bam.apps.BamConfig` to `INSTALLED_APPS` in the project's
+     `settings.py`.
 
   5. Set `bam.hashers.LDAPPBKDF2PasswordHasher` as the first item of the
      `PASSWORD_HASHERS` array in the project's `settings.py`.