Update XPath Builder::first() method to use limit and offset (find, sort and limit objects service)

Author: robgridley

README.md

@@ -225,7 +225,7 @@ foreach ($estimates as $estimate) {
 }
 ```
 
-KeyCollection also has a number of useful methods such as `all()`, `paginate()` and `first()`. In fact, the single object find example from earlier is just a shortcut to the `KeyCollection::first()` method.
+KeyCollection also has a number of useful methods such as `all()`, `paginate()` and `first()`.
 
 ## Relationships
 

src/XPath/Builder.php

@@ -139,7 +139,7 @@ public function find(): KeyCollection
      */
     public function first(): ?Model
     {
-        return $this->find()->first();
+        return $this->model->find($this->toXPath(), $this->toXPathSort(), 0, 1, $this->toFieldDescriptor())->first();
     }
 
     /**