Update README.md

Author: satish-m

README.md

@@ -100,10 +100,11 @@ the first column name return by the query.!
 
 Example-
 
+```
 commands:
    - command: "select foo as foobar from bar where id = 10"
      displayPrefix: "Expedia"
-
+```
 For the above query metric path will be "Custom Metrics|SQL|localhost|Expedia|foobar".