Notify users of new version

[dpmccabe]

Would it be possible for nfldb-update to output a message when a new release is available and perhaps required to download the new data? I wasn't getting the 2015 playoff games in my update until I upgraded from 1.2.9 to 1.2.10, though I'm not sure if that was due to a quirk in my setup or if there was a relevant commit that enabled that feature. It's definitely not a big deal if an occasional upgrade to the package is needed, but I think the script should be aware of that since updates are its primary responsibility.

Thanks for your work on this. Would love to contribute, but I'm only a Ruby dev.

[mganley2000]

You ended up doing this, right?

C:\Python27\Scripts>pip install --upgrade nflgame
C:\Python27\Scripts>python nfldb-update

Upgrading nflgame allowed you to get playoff games for the 2014 Postseason (Jan & Feb 2015.)