There is nothing major in those pull requests/issues, but they are ignored. This project is great for what it does (lets you parse cron schedule input and gives you a datetime of the next execution), but the author seems to have abandoned the project. Now I am left with a difficult choice of using the project as is, or forking it and and making my own changes. If I fork it, I then have to monitor whether the upstream author shows up again and then I have to figure out what to do about his/her changes.
If anything GitHub makes it easier for someone to half-ass a project and then abandon it as it is starting to get popular. Places like SourceForge had some vetting that may or may not have prevented this type of thing. GitHub works well for projects that have lots of contributors, but for a "small library that does X" it becomes a graveyard.