add a link to the benchmark

README.md

@@ -37,7 +37,7 @@ $dotenv->load();
 ## Why should I use this dotenv loader instead of another ?
 
 This package is meant to be faster than the other dotenv loaders.<br>
-How ? By using the native function parse_ini_file.
+But please, don't believe me, check my [small benchmark](https://github.com/rfussien/dotenv-benchmark) out, and try it by yourself.
 
 It has less features, but common, it's about a config file and a minimum
 computing should be done...