fix that or this

mix.exs

@@ -3,7 +3,7 @@ defmodule Grains.Mixfile do
 
   def project do
     [app: :grains,
-     version: "0.0.72",
+     version: "0.0.73",
      elixir: "~> 1.2",
      elixirc_paths: elixirc_paths(Mix.env),
      compilers: [:phoenix, :gettext] ++ Mix.compilers,

web/static/js/presencesketch.js

@@ -350,12 +350,13 @@ Boid.prototype.render = function(list) {
 
   // the master looks at his minions and draws lines
   if (list) {
+    let that = this;
     let neighbordist = 250;
     _.each(list, function(boid) {
       var d = p5.Vector.dist(that.position, boid.position);
       if ((d > 0) && (d < neighbordist)) {
-        this.p.stroke(255);
-        this.p.line(this.position.x, this.position.y,
+        that.p.stroke(255);
+        that.p.line(that.position.x, that.position.y,
                     boid.position.x, boid.position.y);
       }
     });