Fixing reference to versions < ES6

DrkSephy · DrkSephy · commit 7b7ad558ef6c · 2016-02-03T18:37:28.000-05:00
diff --git a/README.md b/README.md
@@ -807,7 +807,7 @@ for (let [key, value] of map.entries()) {
 
 ## WeakMaps
 
-In order to store private data in < ES5, we had various ways of doing this.
+In order to store private data versions < ES6, we had various ways of doing this.
 One such method was using naming conventions:
 
 ```javascript
