[CHANGELOG] Generated for v1.3.0

Author: lchrusciel

CHANGELOG-1.3.md

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+# CHANGELOG FOR `1.3.X`
+
+## v1.3.0 (2021-04-22)
+
+#### TL;DR
+
+- Added support for Sylius 1.9 and drop 1.7
+
+### Added
+- [#700](https://github.com/Sylius/ShopApiPlugin/issues/700) Adding a subtotal property to the cart endpoint ([@mamazu](https://github.com/mamazu))
+- [#701](https://github.com/Sylius/ShopApiPlugin/issues/701) Availability product variant ([@alexander-schranz](https://github.com/alexander-schranz), [@mamazu](https://github.com/mamazu))
+
+### Changed
+- [#692](https://github.com/Sylius/ShopApiPlugin/issues/692) [README] Update supported versions ([@lchrusciel](https://github.com/lchrusciel))
+- [#698](https://github.com/Sylius/ShopApiPlugin/issues/698) [Maintenance] Drop support for Sylius 1.7 ([@lchrusciel](https://github.com/lchrusciel))
+
+### Fixed
+- [#706](https://github.com/Sylius/ShopApiPlugin/issues/706) [Address] Handle adress exists validation in case when address does not belong to any customer ([@hurricane-voronin](https://github.com/hurricane-voronin))