update readme for multiple column relative

Author: l3aro

README.md

@@ -248,6 +248,17 @@ User::query()->filter([
 ]);
 ```
 
+You can also filter multiple columns at once
+```php
+use Baro\PipelineQueryCollection\FieldsRelativeFilter;
+use Baro\PipelineQueryCollection\Enums\WildcardPositionEnum;
+
+// users?search=Baro
+User::query()->filter([
+    FieldsRelativeFilter::make('search', ['name', 'title']), //  where ("name" like '%Baro%' or "title" like '%Baro%')
+]);
+```
+
 #### Scope filter
 
 ```php

tests/FilterTest.php

@@ -220,9 +220,9 @@
     TestModel::factory()->create(['name' => 'Baro', 'title' => 'Joe']);
     TestModel::factory()->create(['name' => 'Billy', 'title' => 'Nil']);
 
-    injectRequest(['name' => 'Baro']);
+    injectRequest(['search' => 'Baro']);
 
     expect(TestModel::filter([
-        FieldsRelativeFilter::make('name', ['name', 'title']),
+        FieldsRelativeFilter::make('search', ['name', 'title']),
     ])->count())->toBe(2);
 });