v2.3.0

• add replace() method.
• add pipe() method.
• add chars() method.
• add getIterator() method.
• add offsetExists() offsetGet() offsetSet() offsetExists() methods.
• implement interface: ArrayAccess, Countable, IteratorAggregate.
• improve methods trim() trimLeft() trimRight()
• improve tests for replaceArray() method.
• improve tests workflow
• general code refactoring