4.0.0-alpha.0

Major Changes

• [client] update ScalarConverter to accept any objects (#819) @dariuszkuc
• [generator] built-in support for optional input (#808) @dariuszkuc
• [client] change GQL client to interface and add webclient implementation (#837) @dariuszkuc

Patch Changes

• Update to kotlin 1.4 (#844) @smyrick

Non-version Changes

• [docs] update latest released version to 3.6.1 (#848) @dariuszkuc
• Add test to verify interface implementations can be ignored (#846) @smyrick
• [build] officially start targeting 4.0.0 (#847) @dariuszkuc