fix(karol-f#26): Avoid using eval

Author: karol-f

src/utils/isES2015.js

@@ -1,8 +1,5 @@
 function isES2015() {
   if (typeof Symbol === 'undefined' || typeof Reflect === 'undefined') return false;
-  try {
-    eval('class Foo {}'); // eslint-disable-line no-eval
-  } catch (e) { return false; }
 
   return true;
 }