async_result

• add fromJson and toJson methods to classes.

• add test and documentation for AsyncResult class.

• remove deprecated fields from equality check

• add value equality for Result class

• Marked hasData and hasError as deprecated. Use isSuccess and isError instead.

• Add more static methods such as zip4 and zip5.

• Add more static methods such as zip2, zip3, zipMultiple.

• Add more static methods such as anySuccess, anyLoading, anyCompeted and anyError.

• Add new static methods.

• Add new methods and update readme file.

## 1.0.3

- Add new methods whenOrNull, maybeMap, mapOrNull and getDataOrElse.

## 1.0.2

- Updated examples.

## 1.0.1

- Updated toString.

## 1.0.0

- Initial version.