Use correct CVE ID for json-jwt vulnerability

Author: reedloden

gems/json-jwt/CVE-2018-3768.yml gems/json-jwt/CVE-2018-1000539.ymlgems/json-jwt/CVE-2018-3768.yml renamed to gems/json-jwt/CVE-2018-1000539.yml

@@ -1,6 +1,6 @@
 ---
 gem: json-jwt
-cve: 2018-3768
+cve: 2018-1000539
 date: 2018-04-30
 url: https://github.com/nov/json-jwt/pull/62
 title: Auth tag forgery vulnerability with AES-GCM encrypted JWT