 Model package may be broken

When I run `ml install colorize`, I'm getting this as a result:

```
Package https://codeload.github.com/mlhubber/colorize/zip/master

Downloading 'colorize-master.zip' (958,538 bytes) ...

Extracting 'colorize-master.zip' ...

mlhub: No such package file: data
  The model package may be broken!
```