Update to browserify@^6.3.2

Related:
#6
stackgl/shader-school#113

Author: hughsk

package.json

@@ -57,7 +57,7 @@
     "bl": "^0.9.3",
     "brfs": "^1.2.0",
     "browser-menu": "^1.0.1",
-    "browserify": "^6.1.0",
+    "browserify": "^6.3.2",
     "brstar": "^0.1.0",
     "bunny": "^1.0.1",
     "canvas-fit": "^1.2.0",