Apply fixes from StyleCI

Author: StyleCIBot

tests/Validation/ValidationValidatorTest.php

@@ -18,7 +18,6 @@
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Support\Arr;
 use Illuminate\Support\Carbon;
-use Illuminate\Support\Exceptions\MathException;
 use Illuminate\Support\Stringable;
 use Illuminate\Translation\ArrayLoader;
 use Illuminate\Translation\Translator;