Add Ivan Nikulin to acks

zcorpan · Alice Boxhall · commit 4330abb66425 · 2019-01-08T09:48:22.000+11:00
For whatwg#2669 and earlier contributions.
diff --git a/source b/source
@@ -120240,6 +120240,7 @@ INSERT INTERFACES HERE
   isonmad,
   Iurii Kucherov,
   Ivan Enderlin,
+  Ivan Nikulin, <!-- inikulin on GitHub -->
   Ivo Emanuel Gon&ccedil;alves,
   J. King,
   J.C. Jones,
