Changelog for dunai-test-0.8.3

2022-06-21 Ivan Perez <ivan.perez@keera.co.uk> * dunai-test.cabal: Version bump (0.8.3) (#302). 2022-04-21 Ivan Perez <ivan.perez@keera.co.uk> * dunai-test.cabal: Version bump (0.8.2) (#280), declare changelog file (#273), declare subdir of source-repository (#272). * CHANGELOG: Add CHANGELOG file (#273).