add length to email to allow for unique index

database/migrations/2018_06_04_214558_admin_users.php

@@ -17,8 +17,8 @@ class AdminUsers extends Migration
             $table->increments('id');
             $table->integer('admin_user_group_id')->unsigned();
             $table->string('full_name');
-            $table->string('email');
-            $table->string('password');
+            $table->string('email', 100);
+            $table->string('password', 100);
             $table->timestamps();
             $table->softDeletes(); // this means that we can keep ahold of old users but prevent access