Fix Cargo.toml

Bump up version to 1.4.0 (#569)

* Fix lint

* Bump up version to 1.4.0

Bump up version to 1.3.2 (#567)

Bump up version to 1.3.1 (#565)

Bump up version to 1.3.0 (#563)

Replace as_map() with as_value() for proper JSON type handling (#556)

* Replace as_map() with as_value() for proper JSON type handling

* Bump up version to 1.2.0

Bump up version to 1.1.2 (#555)

Fix release.yml

Fix release.yml

Update README.md