Update supported node version

rzcoder · web-flow · commit aa575046e85f · 2018-05-14T17:47:43.000+05:00
diff --git a/README.md b/README.md
@@ -27,7 +27,7 @@ console.log('decrypted: ', decrypted);
 ```shell
 npm install node-rsa
 ```
-> <sub>Requires nodejs >= 0.10.x or io.js >= 1.x</sub>
+> <sub>Requires nodejs >= 8.11.1</sub>
 
 ### Testing
 
