Cannot retrieve ticket comments

[README.md](https://github.com/sjkingo/python-freshdesk/blob/87ccfb3/README.md?plain=1#L277-L278) states the following:

> \>\>\> ticket.comments[0]
> [...]

Trying to access `comments`  on a `Ticket` instance fails with the following error when using `freshdesk.api.API` or `freshdesk.v2.api.API`:

> 'Ticket' object has no attribute 'comments'

It works fine for `freshdesk.v1.api.API`.