Add VERSION file
Add VERSION file

Adds a `VERSION` file so as to be better standardized with other Stripe
bindings projects. I'm also separately adding a script for automating
the release of this library, so we shouldn't have to worry about this
falling out of date.

ChannelMeter/stripe-go,dominicphillips/stripe-go,froatsnook/stripe-go,stripe/stripe-go,dominicphillips/stripe-go,froatsnook/stripe-go,mondough/stripe-go,ChannelMeter/stripe-go,stripe/stripe-go,mondough/stripe-go