create migration to remove fleet_end from Fleets table

cleaned up register fleet in FleetsController
modified FleetHelper class

database/migrations/2018_12_03_193037_drop_fleet_end_column_fleets_table.php

@@ -0,0 +1,32 @@
+<?php
+
+use Illuminate\Support\Facades\Schema;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Migrations\Migration;
+
+class DropFleetEndColumnFleetsTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('Fleets', function($table) {
+            $table->dropColumn('fleet_end');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('Fleets', function($table) {
+            $table->dateTime('fleet_end');
+        });
+    }
+}