fix: browser to use UMD

Author: robertleeplummerjr

package.json

@@ -113,5 +113,5 @@
   },
   "types": "dist/src",
   "unpkg": "dist/browser.js",
-  "version": "2.0.0-beta.10"
+  "version": "2.0.0-beta.11"
 }

rollup.config.browser.js

@@ -34,13 +34,12 @@ export default {
   output: [
     {
       file,
-      format: 'iife',
+      format: 'umd',
       sourcemap: true,
       globals: {
-        'gpu.js': `(typeof window.gpu !== undefined) ? window.gpu : null`,
+        'gpu.js': `GPU`,
       },
       name,
-      footer: '\nif(typeof window!==undefined){window.brain=brain}',
     },
   ],
 };