Re-enable autocompletion

[CoveMB]

Describe the bug A clear and concise description of what the bug is.

Hello I think there is a problem with the autocompletion package for zsh

To Reproduce Steps to reproduce the behavior: 1. enter the following command in your CLI echo '. <(denon --completion)' >> ~/.zshrc 2. close and open back that interface again 3. The following errror will apear

note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
fatal runtime error: failed to initiate panic, error 5```

**Expected behavior**
No errors in the CLI

**Setup**

- OS: linux
- Deno version:  1.3.3
- Denon version:  v2.3.3
- CLI : zsh

**Additional context**
Might be related to this? 
https://github.com/rust-lang/cargo/issues/5234

[eliassjogreen]

Denons autocompletion is currently turned off due to the badly supported autocompletion library omelette which Denon used to use. We (the org) are planning on creating our own deno module for autocompletion in the near future which will solve this issue.