Update xrg.rb

Casks/x/xrg.rb

@@ -10,9 +10,11 @@ cask "xrg" do
 
   livecheck do
     url :homepage
-    regex(%r{href=.*?/XRG-release-(\d+(?:\.\d+)+)\.zip}i)
+    regex(%r{href=.*?/XRG[._-]release[._-]v?(\d+(?:\.\d+)+)\.zip}i)
   end
 
+  depends_on macos: ">= :high_sierra"
+
   app "XRG.app"
 
   zap trash: [