links: add refs in metadata

Fixes: nodejs#117

lib/links.js

@@ -45,11 +45,12 @@ class LinkParser {
   // Do this so we can reliably get the correct url.
   // Otherwise, the number could reference a PR or an issue.
   getRefUrlFromOP(ref) {
-    const as = this.OP.querySelectorAll('a.issue-link');
+    const as = Array.from(this.OP.children)
+      .filter(c => c.textContent.includes('Refs'))
+      .map(a => a.querySelector('a'));
     const links = Array.from(as);
     for (const link of links) {
-      const text = link.textContent;
-      if (text === ref) {
+      if (link.textContent === ref) {
         const href = link.getAttribute('href');
         if (href) return href;
       }