Warning at compile time: [ObservableStores]

[telatin]

Not sure if this is a real issue, so just reporting and in the case can be ignored :)

I'm currently using Version 1.2.6:

{path}/.nimble/pkgs/docopt-0.6.8/docopt.nim(113, 1) Warning: observable stores to 'result' [ObservableStores]
```