Update readme to add details about multiple hierarchies

Could you kindly assign this issue to me?

Please check if it's correct- https://git.drupalcode.org/issue/entity_hierarchy-3295326/-/commit/fb5a8...

Left some comments

royalpinto007 → closed merge request !17

Kindly review the previously submitted merge request. I regret to inform that a new one was created in error.

It is ordinary to keep README files to an 80-character line-length.

Hi @royalpinto007,

Applied the MR !16 to the Entity Reference Hierarchy module with 3.3.5 version and confirmed updated perfectly!.

Please see the attached files for your reference.

Thank you.