readme: drop node < 4 [skip ci]

babel · Nov 17, 2016 · 483586f · 483586f
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commit 483586f
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diff --git a/README.md b/README.md
@@ -4,6 +4,8 @@ An `eslint` plugin companion to `babel-eslint`. `babel-eslint` does a great job
 for use with Babel, but it can't change the built in rules to support experimental features.
 `eslint-plugin-babel` re-implements problematic rules so they do not give false positives or negatives.
 
+> Requires Node 4 or greater
+
 ### Install
 
 ```sh