Expand warn message with dev option

Author: ken-kost

lib/mix/tasks/ash_postgres.generate_migrations.ex

@@ -114,7 +114,7 @@ defmodule Mix.Tasks.AshPostgres.GenerateMigrations do
 
     if !opts[:name] && !opts[:dry_run] && !opts[:check] && !opts[:snapshots_only] && !opts[:dev] do
       IO.warn("""
-      Name must be provided when generating migrations, unless `--dry-run` or `--check` is also provided.
+      Name must be provided when generating migrations, unless `--dry-run` or `--check` or `--dev` is also provided.
       Using an autogenerated name will be deprecated in a future release.
 
       Please provide a name. for example: