Update version numbers for listed technologies in README.md

[rheeluke]

The version numbers in install/download_tech have outpaced the documentation. Help them catch up.

[rheeluke]

I have a fix ready for this, I just need a branch that I have permission to push to.

[ronaknnathani]

@rheeluke You can fork the repo, create a new branch, push changes on that repo and then you can make a pull request. Let us know if you have further questions.