Update CVE-2016-2337 URL to NVD

Author: jasnow

rubies/ruby/CVE-2016-2337.yml

@@ -2,7 +2,7 @@
 engine: ruby
 cve: 2016-2337
 ghsa: f58m-77qc-8gjv
-url: https://github.com/advisories/GHSA-f58m-77qc-8gjv
+url: https://nvd.nist.gov/vuln/detail/CVE-2016-2337
 title: Type confusion exists in _cancel_eval Ruby's TclTkIp class
 date: 2017-01-06
 description: |