add unions

docs/js/upgrade.js

@@ -1,5 +1,9 @@
 let exec = {};
 
+exec.doNothing = function() {
+
+}
+
 exec.addCube = function () {
     cubePos.push([Math.random() * 1000 - 500, Math.random() * 1000 - 500, Math.random() * 30 - 200,
     Math.random() * 2 - 1, Math.random() * 2 - 1, Math.random() * 2 - 1
@@ -11,6 +15,12 @@ upgrades = [
         'price': 30,
         'exec': 'addCube',
         'desc': 'Clicks and waiting generate more nil'
+    },
+    {
+        'name': 'Union',
+        'price': 1000,
+        'exec': 'doNothing',
+        'desc': 'Earlier-bought Sets are more powerful'
     }
 ];