Added John Helly to developers list.

data/contact.yaml

@@ -3,11 +3,12 @@ people: [
     name: Dr. Matthieu Schaller,
     role: Project co-PI (Astro),
     affil: "ICC, Durham University -- Leiden Observatory",
-    href: "icc.dur.ac.uk/~jlvc76"
+    href: "http://icc.dur.ac.uk/~jlvc76"
   },
   {
     name: Dr. Pedro Gonnet,
     role: Project co-PI (CompSci),
+    href: "https://scholar.google.com/citations?user=IqOpdUkAAAAJ&hl=en",
     affil: "ECS, Durham University -- Google Switzerland"
   },
   {
@@ -79,4 +80,9 @@ people: [
     role: Astronomer,
     affil: "Dublin City University"
   },
+  {
+    name: Dr John Helly,
+    role: Developer,
+    affil: "ICC, Durham University"
+  },
 ]