Add template for when no git information is available #131
Description
It's possible for users to download the library from Github without any git history ("Download ZIP" button). Currently that seems to use the template config assuming it's a release. Instead I was wondering if there could be a config option for when there's no git information available so I could write out the version as 2.1+unknown instead of 2.1 so I don't have users who installed a development version in this way reporting the error as version 2.1 as if it were the released version and not some random other version.