unrecognized arguments: --pid

Hi, ntfy in my environment doesn't recognize pid parameter. Any idea why this happens? I use:
ntfy: 2.7.0
python: 3.6.10
ubuntu: 20.04

And here's exactly what I get:
```
$ ntfy done --pid 446307
usage: ntfy [-h] [-c CONFIG] [-b BACKEND] [-o key value]
[-l {CRITICAL,ERROR,WARNING,INFO,DEBUG}] [-v] [-q] [--version]
[-t TITLE]
{send,done,shell-integration} ...
ntfy: error: unrecognized arguments: --pid
```