`jupyter-standaloneproxy --version` returns `0.0`

[manics]

Bug description

Running jupyter-standaloneproxy --version returns 0.0 instead of the actual version

How to reproduce

$ pip install jupyter_server_proxy
...

$ pip list |grep jupyter_server_proxy
jupyter_server_proxy      4.5.0

$ jupyter-standaloneproxy --version
0.0

Expected behaviour

It should return the version of jupyter-server-proxy

Actual behaviour

It returns 0.0