Nimble #head doesn't recognize tasks
Trying to compile choosenim:

```
> nimble build
       Tip: 3 messages have been suppressed, use --verbose to show them.
     Error: Could not read package info file in /home/gt/programming/choosenim/choosenim.nimble;
        ...   Reading as ini file failed with:
        ...     Invalid section: .
        ...   Evaluating as NimScript file failed with:
        ...     home/gt/programming/choosenim/choosenim.nimble(21, 1) Error: undeclared identifier: 'task'.
```