Can't start watcher, weird channel errors? Data is 000

I finally decided to activitywatch after only knowing about this project for 4 years.

I installed this plugin and needed to copy some of the configuration to my `vimrc`. Spoiler alert: I did this: `let g:aw_apiurl_host = 127.0.0.1`.

Fast forward two hours of me learning lots about the rest API of `aw-server`, jobs and vim channels, trying to debug why `curl -s http://127001/api/0/buckets//` wasn't working only to realise if you actually put `let g:aw_apiurl_host = 127.0.0.1` into your `vimrc` then you're gonna have a BAD time. `127.0.0.1` actually concatenates that into `127001` and doesn't throw an error like how I would it expect it to do. So that's a learning.

My own debug logs of this, the "channel data" is somehow `000`?

Not sure what can be done with this, I tried to add some validation:

```vim
function! AWStart()
" :h types here
if type(s:apiurl_host) != 1
echoerr "g:apiurl_host must be a string!"
return
endif
if type(s:apiurl_port) != 0
echoerr "g:apiurl_host must be a number!"
return
endif
call s:CreateBucket()
endfunc

```

But since it's a string it passed my ad-hoc validation.

Naturally, I can blame the documentation: ^{he said sarcastically, please don't hurt me}

Not sure what to make of this issue, but it hopefully makes someone that is having the same issue that might be searching github issues to find me in 2021 writing a post mortem 3 minutes to 1 am at a rainy wednesday night/morning.

Feel free to do whatever to this issue.