use custom url

Author: lorenzwalthert

DESCRIPTION

@@ -30,7 +30,7 @@ Encoding: UTF-8
 LazyData: true
 Date: 2018-03-07
 BugReports: https://github.com/r-lib/styler/issues
-URL: https://github.com/r-lib/styler, https://r-lib.github.io/styler/
+URL: https://github.com/r-lib/styler, https://styler.r-lib.org/
 Roxygen: list(markdown = TRUE, roclets = c("rd", "namespace", "collate", "pkgapi::api_roclet"))
 RoxygenNote: 6.0.1
 VignetteBuilder: knitr