[Release] Generate changelog for v1.2.0

Author: lchrusciel

CHANGELOG-1.2.md

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+# CHANGELOG FOR `1.2.X`
+
+## v1.2.0 (2020-12-08)
+
+#### TL;DR
+
+- Added support for Sylius 1.8
+
+### Added
+- [#682](https://github.com/Sylius/ShopApiPlugin/issues/682) Decorating the UserCartRecalculationListener ([@JakobTolkemit](https://github.com/JakobTolkemit))
+
+### Changed
+- [#655](https://github.com/Sylius/ShopApiPlugin/issues/655) Adding a release table ([@mamazu](https://github.com/mamazu))
+- [#670](https://github.com/Sylius/ShopApiPlugin/issues/670) Fixing a typo in the documentation ([@mamazu](https://github.com/mamazu))
+- [#673](https://github.com/Sylius/ShopApiPlugin/issues/673) Documentation: fix wrong parameter name ([@sylvainraye](https://github.com/sylvainraye))
+- [#680](https://github.com/Sylius/ShopApiPlugin/issues/680) Fixing typo in configuration filename ([@mamazu](https://github.com/mamazu))
+- [#687](https://github.com/Sylius/ShopApiPlugin/issues/687) Fixing cart item definition ([@mamazu](https://github.com/mamazu))
+- [#688](https://github.com/Sylius/ShopApiPlugin/issues/688) [Maintenance] Update dependencies versions ([@lchrusciel](https://github.com/lchrusciel))
+
+### Fixed
+- [#658](https://github.com/Sylius/ShopApiPlugin/issues/658) Fixes #657 ([@mamazu](https://github.com/mamazu))