Update readme & changelog

Author: sebastiandedeyne

CHANGELOG.md

@@ -2,6 +2,9 @@
 
 All notable changes to `laravel-collection-macros` will be documented in this file
 
+## 3.3.0 - 2017-10-17
+- Added `at`
+
 ## 3.2.0 - 2017-10-11
 - Added `rotate`
 

README.md

@@ -35,6 +35,7 @@ The package will automatically register itself.
 ## Macros
 
 - [`after`](#after)
+- [`at`](#at)
 - [`before`](#before)
 - [`chunkBy`](#chunkby)
 - [`collect`](#collect)
@@ -86,6 +87,18 @@ $currentItem = 3;
 $collection->after($currentItem, $collection->first()); // return 1;
 ```
 
+### `at`
+
+Retrieve an item at an index.
+
+```php
+$data = new Collection([1, 2, 3]);
+
+$data->at(0); // 1
+$data->at(1); // 2
+$data->at(-1); // 3
+```
+
 ### `before`
 
 Get the previous item from the collection.