Removed poly for atob and btoa as it's not needed since node 16

Author: WebReflection

README.md

@@ -29,7 +29,7 @@ console.assert(
 );
 ```
 
-**Please note** this module requires global `atob` and `btoa` in NodeJS, polyfilled in tests in here as such.
+**Please note** this module requires global `atob` and `btoa` in NodeJS **< 16**, polyfilled in old tests in here as such.
 
 ```js
 global.btoa = str => Buffer.from(str).toString('base64');

package.json

@@ -8,7 +8,7 @@
     "cjs": "ascjs esm cjs",
     "rollup:new": "rollup --config rollup/new.config.js",
     "rollup:babel": "rollup --config rollup/babel.config.js",
-    "min": "uglifyjs index.js --support-ie8 --comments=/^!/ -c -m -o min.js",
+    "min": "uglifyjs index.js -c -m -o min.js",
     "coveralls": "nyc report --reporter=text-lcov | coveralls",
     "test": "nyc node test/index.js"
   },

test/index.js

@@ -1,6 +1,3 @@
-global.btoa = str => Buffer.from(str).toString('base64');
-global.atob = str => Buffer.from(str, 'base64').toString();
-
 const {encode, decode} = require('../cjs');
 
 const even = new Uint8Array([0, 1, 2, 3]);