Rename migration stubs so they show next to each other (#127)

assets/migrations/2019_08_08_000000_create_tenants_table.php

@@ -1,35 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-use Illuminate\Database\Migrations\Migration;
-use Illuminate\Database\Schema\Blueprint;
-use Illuminate\Support\Facades\Schema;
-
-class CreateTenantsTable extends Migration
-{
-    /**
-     * Run the migrations.
-     *
-     * @return void
-     */
-    public function up()
-    {
-        Schema::create('tenants', function (Blueprint $table) {
-            $table->string('id', 36)->primary(); // 36 characters is the default uuid length
-            // (optional) your custom, indexed columns can go here
-
-            $table->json('data');
-        });
-    }
-
-    /**
-     * Reverse the migrations.
-     *
-     * @return void
-     */
-    public function down()
-    {
-        Schema::drop('tenants');
-    }
-}