Fossil is a great solution for very small teams, even teams of one. It supplies all the usual features you'd expect of a modern version control system. In addition, it provides a wiki and a ticket tracker that are also stored in the repository. Remember that even as a solo developer, you are still in a collaboration of sorts with your future self; a trouble ticket tracker can be very helpful as a reminder of things that you will need to do later, even if you never make it publicly available to your end users.