Merge pull request #53 from fkmclane/patch-1

Gentoo 'x11-misc/slop' package now in main tree

README.md

 * [FreeBSD: x11/slop](http://www.freshports.org/x11/slop/)
 * [OpenBSD: graphics/slop](http://openports.se/graphics/slop)
 * [CRUX: 6c37/slop](https://github.com/6c37/crux-ports/tree/3.2/slop)
-* [Gentoo: x11-misc/slop::fkmclane](https://github.com/fkmclane/overlay/tree/master/x11-misc/slop)
+* [Gentoo: x11-misc/slop](https://packages.gentoo.org/packages/x11-misc/slop)
 * [GNU Guix: slop](https://www.gnu.org/software/guix/packages/#slop)
 * Please make a package for slop on your favorite system, and make a pull request to add it to this list.