bump reported version number
bump reported version number

Summary:
update reported version number to match our semver git tagging

I'm not 100% sure how I feel about this but it seems like we should aspire
to have the existing --version argument return something that matches
our semver git tagging. Opening for discussion!

Test Plan: none

Reviewers: ethan, csilvers, william

Reviewed By: ethan, csilvers, william

Projects: #devenvfixup

Differential Revision: https://phabricator.khanacademy.org/D19606

Khan/git-bigfile