updating since when the comment was added

[fbstj]

the README states "checks for updates within the last month" would it be possible to augment that it checks for updates since the comment line was added / last changed from the history of the code (git blame? for eg)

[Sohalt]

I've implemented something like this for github issues in a small shell script. A little hacky, but maybe it's useful: https://gist.github.com/Sohalt/0a87aa5a0730e81a4320e061806ee5e5