Remove trailing spaces

Author: not-an-aardvark

README.md

@@ -2993,7 +2993,7 @@ Other Style Guides
 
     // good
     this.firstName = 'Panda';
-    
+
     // good, in environments where WeakMaps are available
     // see https://kangax.github.io/compat-table/es6/#test-WeakMap
     const firstNames = new WeakMap();