bundle exec ./benchmark -> bundle exec rake bench

README.md

@@ -17,7 +17,7 @@ or add it to your Bundler Gemfile
 About 1.2–20x faster than Active Support on my machine (your mileage my vary, depends on string length):
 
 ```
-$ bundle exec ./benchmark
+$ bundle exec rake bench
 
 ================== Test String Length: 0 ==================
 Warming up --------------------------------------