added missing newlines

Author: stefanak-michal

src/structures/Node.php

@@ -70,4 +70,4 @@ public function __toString(): string
             'properties' => $this->properties
         ]);
     }
-}
+}

src/structures/Relationship.php

@@ -100,4 +100,4 @@ public function __toString(): string
             'properties' => $this->properties
         ]);
     }
-}
+}

src/structures/UnboundRelationship.php

@@ -70,4 +70,4 @@ public function __toString(): string
             'properties' => $this->properties
         ]);
     }
-}
+}