add example for negative array index

README.md

@@ -155,6 +155,7 @@ Given the json
 | <a href="http://jsonpath.herokuapp.com/?path=$.store.*" target="_blank">$.store.*</a>                  | All things, both books and bicycles  |
 | <a href="http://jsonpath.herokuapp.com/?path=$.store..price" target="_blank">$.store..price</a>             | The price of everything         |
 | <a href="http://jsonpath.herokuapp.com/?path=$..book[2]" target="_blank">$..book[2]</a>                 | The third book                      |
+| <a href="http://jsonpath.herokuapp.com/?path=$..book[2]" target="_blank">$..book[-2]</a>                 | The second to last book            |
 | <a href="http://jsonpath.herokuapp.com/?path=$..book[0,1]" target="_blank">$..book[0,1]</a>               | The first two books               |
 | <a href="http://jsonpath.herokuapp.com/?path=$..book[:2]" target="_blank">$..book[:2]</a>                | All books from index 0 (inclusive) until index 2 (exclusive) |
 | <a href="http://jsonpath.herokuapp.com/?path=$..book[1:2]" target="_blank">$..book[1:2]</a>                | All books from index 1 (inclusive) until index 2 (exclusive) |