Modify URL in description

Author: RLumSK

DESCRIPTION

@@ -17,7 +17,7 @@ Authors@R: c(
     person("Marcin", "Wojdyr", role = c("cph"), comment = "C++ library 'xylib'"),
     person("Peng", "Zhang", role = c("cph"), comment = "C++ library 'xylib'"))
 Maintainer: Sebastian Kreutzer <[email protected]>
-URL: https://github.com/R-Lum/rxylib
+URL: https://r-lum.github.io/rxylib
 BugReports: https://github.com/R-Lum/rxylib/issues
 License: GPL-3 | LGPL-2.1
 SystemRequirements: