fix trim

Author: taylorotwell

src/Illuminate/Support/Stringable.php

@@ -542,7 +542,7 @@ public function substr($start, $length = null)
      */
     public function trim($characters = null)
     {
-        return new static(trim($this->value, $characters));
+        return new static(trim(...array_merge([$this->value], func_get_args())));
     }
 
     /**

tests/Support/SupportStringableTest.php

@@ -24,4 +24,11 @@ public function testMatch()
         $this->assertEquals(['un', 'ly'], $string->matchAll('/f(\w*)/')->all());
         $this->assertTrue($string->matchAll('/nothing/')->isEmpty());
     }
+
+    public function testTrim()
+    {
+        $string = new Stringable(' foo ');
+
+        $this->assertEquals('foo', (string) $string->trim());
+    }
 }