Updated price name in example get_items() response

[justarandomguyintheinternet]

• Updated the name of the price field in the example response for client.get_items() to item_price, to be the same as what the API currently returns

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (78c4136) 70.40% compared to head (4138572) 70.40%. Report is 4 commits behind head on master.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #287 +/- ## ======================================= Coverage 70.40% 70.40% ======================================= Files 3 3 Lines 196 196 Branches 28 28 ======================================= Hits 138 138 Misses 57 57 Partials 1 1 ```

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