Updated packages.json

There was an issue with Package Control trying to download `https://github.com/enriquein/JavaSetterGetter/archive/v1.6.0.zip` After looking at a few other packages and how they list the zip file in the `packages.json` I changed it to `https://nodeload.github.com/enriquein/JavaSetterGetter/zip/master`

Inside `Package Control.py` - The script that was throwing the errors, I tested it with:

```python
# lines 3182 - 3185 in Package Control.py
if url == 'https://github.com/enriquein/JavaSetterGetter/archive/v1.6.0.zip':
    url = 'https://nodeload.github.com/enriquein/JavaSetterGetter/zip/master'
```

And the package installed just fine.