Use brikz.js name for UMD file as well.

package.json

@@ -4,7 +4,7 @@
   "description": "Reconfigurable micro composition of object APIs",
   "main": "brikz.js",
   "scripts": {
-    "build": "umd brikz < brikz.js > brikz.umd.js",
+    "build": "umd brikz < brikz.js > umd/brikz.js",
     "test": "echo \"Error: no test specified\" && exit 1"
   },
   "repository": {