Document revisions

Date	Change
July 2018	Initial release
March 2020	Updated architecture to enhance security; updated solution to support Python 3.x and Node.js 12.x
July 2020	Updated solution to include weather a forecast Lambda function. For information about updates and changes for v1.2.0, refer to the CHANGELOG.md file in the GitHub repository.
October 2020	Updated the solution to include a pizza ordering microservice. For information about updates and changes for v1.3.0, refer to the CHANGELOG.md file in the GitHub repository.
November 2020	AWS CDK and AWS Solutions Constructs to create AWS CloudFormation template. For information about updates and changes for v1.4.0, refer to the CHANGELOG.md file in the GitHub repository.
February 2021	Integrated Amazon Lex as an option for the brain module of the chatbot. For information about updates and changes for v1.5.0, refer to the CHANGELOG.md file in the GitHub repository.
April 2021	Replaced custom ML module with Amazon Lex and integrated all AWS Lambda functions with Amazon Lex bot. For information about updates and changes for v1.6.0, refer to the CHANGELOG.md file in the GitHub repository.
December 2021	Added support for Japanese language. For information about updates and changes for v1.6.1, refer to the CHANGELOG.md file in the GitHub repository.