Update changelog.txt for 4.3.0 release.

Author: budzanowski

readme.txt

@@ -85,6 +85,21 @@ Release and roadmap notes available on the [WooCommerce Developers Blog](https:/
 
 == Changelog ==
 
+= 4.3.0 - 2021-01-19 =
+
+#### Bug Fixes
+
+- Update input colors and alignment. ([3597](https://github.com/woocommerce/woocommerce-gutenberg-products-block/pull/3597))
+
+#### Enhancements
+
+- Store API - Fix selected rate in cart shipping rates response. ([3680](https://github.com/woocommerce/woocommerce-gutenberg-products-block/pull/3680))
+- Create get_item_responses_from_schema abstraction. ([3679](https://github.com/woocommerce/woocommerce-gutenberg-products-block/pull/3679))
+- Show itemized fee rows in the cart/checkout blocks. ([3678](https://github.com/woocommerce/woocommerce-gutenberg-products-block/pull/3678))
+- Extensibility: Show item data in Cart and Checkout blocks and update the variation data styles. ([3665](https://github.com/woocommerce/woocommerce-gutenberg-products-block/pull/3665))
+- Improve error displayed to customers when an item's stock status changes during checkout. ([3656](https://github.com/woocommerce/woocommerce-gutenberg-products-block/pull/3656))
+- Introduce SlotFill for Sidebar. ([3361](https://github.com/woocommerce/woocommerce-gutenberg-products-block/pull/3361))
+
 = 4.2.0 - 2021-01-06 =
 
 #### Bug Fixes