docs(README.md): install
docs(README.md): install

update installation + publish to npm and add aws as an owner
STRd6/dynamodb-document-js-sdk,AfterShip/dynamodb-document-js-sdk,awslabs/dynamodb-document-js-sdk,STRd6/dynamodb-document-js-sdk,AfterShip/dynamodb-document-js-sdk,awslabs/dynamodb-document-js-sdk