Please track releases of Qlot

[fukamachi]

Quicklisp is currently looking at the master branch of Qlot, but it would be great if you could change it to look at the latest release on its GitHub repository.

https://github.com/fukamachi/qlot

[fukamachi]

In addition, please ignore quicklisp-client/ directory, which contains the latest release of the Quicklisp client.