docs(version): add more elements (#2779)

Author: liamdebeasi

scripts/release-notes.js

@@ -245,6 +245,21 @@ var versions = [
     minor: '6.3',
     symbol: 'Mn',
     element: 'Manganese'
+  },
+  {
+    minor: '6.4',
+    symbol: 'Fe',
+    element: 'Iron'
+  },
+  {
+    minor: '6.5',
+    symbol: 'Co',
+    element: 'Cobalt'
+  },
+  {
+    minor: '6.6',
+    symbol: 'Ni',
+    element: 'Nickel'
   }
 ];