Add unions to changelog
- Added `Enum` type for mapping enum variables to internal representation used in application.
- Added support for subscriptions.
-- Updated Playground to 1.8.7
-- Split `GraphQLMiddleware` into two classes and moved it to `ariadne.wsgi`
-- Made users responsible for calling `make_executable_schema`
+- Updated Playground to 1.8.7.
+- Split `GraphQLMiddleware` into two classes and moved it to `ariadne.wsgi`.
+- Made users responsible for calling `make_executable_schema`.
+- Added support for unions.
## 0.2.0 (2019-01-07)
