README.md in benchmark_driver-0.13.0 vs README.md in benchmark_driver-0.13.1

@@ -168,10 +168,10 @@
 end
 ```
 
 With following `blank_loop.yml`,
 
-```
+```yml
 loop_count: 20000000
 prelude: |
   class Array
     alias_method :blank?, :empty?
   end