fix About view on Mac so that it opens links in the system web browser

macui/ZeroTier One/AboutViewController.m

@@ -32,6 +32,7 @@
     [self.webView.layer setCornerRadius:1.0f];
     self.webView.layer.masksToBounds = YES;
     [self.webView.layer setBorderColor:[[NSColor darkGrayColor] CGColor]];
+    self.webView.policyDelegate = self;
     
     NSBundle *bundle = [NSBundle mainBundle];
     NSURL *path = [bundle URLForResource:@"about" withExtension:@"html"];