add migration for adding a column with name extradata

src/database/migrations/2019_06_04_092344_edit_admin_table.php

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