Add aligent#186 to release notes

Author: jswift

RELEASE_NOTES.md

@@ -11,6 +11,6 @@
   - [Customer Settings per Channel](https://developer.bigcommerce.com/api-reference/d5e66c45b0415-get-customer-settings-per-channel)
   - [Validate credentials](https://developer.bigcommerce.com/api-reference/3d731215a3dcb-validate-a-customer-credentials)
 - Add the ability to send and receive Images via the Product API, not just the Product Images api (#189)
-
+- Implement the [Wishlists](https://developer.bigcommerce.com/api-reference/03d6065d6f6e5-wishlist) API (#186)