choosenim stable selects wrong version.
As far as I know, nim 1.2.0 is current stable version, but `choosenim stable` selects previous version 1.0.6.

```sh
$ choosenim update self
   Updating choosenim
      Info: Already up to date at version 0.6.0
$ choosenim update stable --latest
   Updating stable
      Info: Already up to date at version 1.2.0
   Switched to Nim 1.2.0
$ choosenim stable
   Switched to Nim 1.0.6
$ choosenim show
  Selected: 1.0.6
   Channel: stable
      Path: /home/pmetras/.choosenim/toolchains/nim-1.0.6

  Versions:  
            #devel
            1.2.0
          * 1.0.6
```

Is there something I don't understand in the way of using choosenim?