Unable to parse index expressions

Using jmespath.py 0.9.3 on Python 3.6.5 I have trouble performing some expressions.

E.g. using this JSON fake data from json-server

`json_data = '[{"id":0,"name":"Fabian Kautzer","avatar":"https://s3.amazonaws.com/uifaces/faces/twitter/anaami/128.jpg","email":"Shaun_Hoppe@hotmail.com","company":"Hessel Group","address":{"zip":"14902","city":"Jonesfort","streetName":"Padberg Groves","streetAddress":"718 Veum Flat","state":"Hawaii"}},{"id":1,"name":"Dr. Alysha Carroll","avatar":"https://s3.amazonaws.com/uifaces/faces/twitter/ssbb_me/128.jpg","email":"Elva52@hotmail.com","company":"Tromp - Mann","address":{"zip":"14233","city":"Watersport","streetName":"Kyleigh Tunnel","streetAddress":"2825 Kuvalis Forges","state":"Oklahoma"}},{"id":2,"name":"Vilma Littel","avatar":"https://s3.amazonaws.com/uifaces/faces/twitter/pcridesagain/128.jpg","email":"Garnett_Purdy@hotmail.com","company":"Mills, Langworth and Herman","address":{"zip":"15174","city":"Noemieland","streetName":"Halvorson Stream","streetAddress":"040 Parker Mission","state":"Wisconsin"}},{"id":3,"name":"Lyda Quigley","avatar":"https://s3.amazonaws.com/uifaces/faces/twitter/kolmarlopez/128.jpg","email":"Craig.Kunde98@gmail.com","company":"Altenwerth Inc","address":{"zip":"74175-8542","city":"North Godfrey","streetName":"Schultz Crossing","streetAddress":"09983 Hermann Crest","state":"Tennessee"}}]'
`

I'm unable to perform single element selection using something like this:

`parsed: jmespath.parser.ParsedResult = jmespath.search("[0].name", json_data)`

This will return `None` when printed using `print(parsed)`. Notice that in general jmespath seems to work since I will get the correct result (current node) when executing this:

`parsed: jmespath.parser.ParsedResult = jmespath.search("@", json_data)`

I tried using the same JSON data and jmespath expression in the online examples engine at http://jmespath.org/examples.html and it works just fine there. Thus either this is a bug or I'm using this Python lib incorrectly. Would be awesome if you could help.