implemented pipe closure with $next as the last parameter

src/Exceptions/PipeException.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace Pest\Exceptions;
+
+use Exception;
+
+class PipeException extends Exception
+{
+    public static function optionalParmetersShouldBecomeRequired(string $expectationName): PipeException
+    {
+        return new self("You're attempting to pipe '$expectationName', but in pipelines optional parmeters should be declared as required)");
+    }
+
+    public static function expectationNotFound($expectationName): PipeException
+    {
+        return new self("Expectation $expectationName was not found in Pest");
+    }
+}