rename abstract method
- String newPath
Renames this file system entity.
Returns a Future<FileSystemEntity> that completes with a
FileSystemEntity instance for the renamed file system entity.
If newPath identifies an existing entity of the same type,
that entity is removed first.
If newPath identifies an existing entity of a different type,
the operation fails and the future completes with an exception.
Implementation
Future<FileSystemEntity> rename(String newPath);