Update version number in Windows installer
Update version number in Windows installer

Set for next Sandstorm release version (somewhat optimistically). But either way it'll be more accurate than a date in 2015, and give some clear indication if a user has installed a modern vagrant-spk.

Fixes #208.
sandstorm-io/vagrant-spk,sandstorm-io/vagrant-spk,sandstorm-io/vagrant-spk