adobe-reader: add knownVulnerabilities

We should really avoid that people unknowingly use Adobe Reader, it
has literally tens of known high-score code execution vulnerabilities,
probably exploited in the wild.

pkgs/applications/misc/adobe-reader/default.nix

@@ -28,5 +28,9 @@ stdenv.mkDerivation {
     description = "Adobe Reader, a viewer for PDF documents";
     homepage = "http://www.adobe.com/products/reader";
     license = stdenv.lib.licenses.unfree;
+    knownVulnerabilities = [
+      "Numerous unresolved vulnerabilities"
+      "See: https://www.cvedetails.com/product/497/Adobe-Acrobat-Reader.html?vendor_id=53"
+    ];
   };
 }