refactor: Rename SQS message model class (#1191)

Change the name of the class to match the name exported from the package
index.

This should not be a breaking change because the class is the default
export of its module. Just in case there is some contrived case that
depends on the class's `name` attribute, we'll include this in the
v2.0.0 major release.

Jira: [ENG-2733]

Author: seb-cr

docs/migration/v2.md

@@ -9,6 +9,7 @@ This doc summarises the breaking changes introduced in v2 and what you need to d
   - [RequestService](#requestservice)
 - [Models](#models)
   - [StatusModel](#statusmodel)
+  - [SQSMessageModel](#sqsmessagemodel)
 
 The new version of dependency injection does not work if code is minified. See [Notes](../../README.md#notes) in the main readme for how to turn this off in webpack.
 
@@ -215,3 +216,5 @@ Note that we can keep `status` unset initially, and TypeScript will complain if
 ### `SQSMessageModel`
 
 The model constructor will now validate that `message` has all fields required of a received SQS message. This should not break existing applications that are using this model correctly, but is included in the 2.0.0 release as a precaution.
+
+The class name has also changed from `Message` to `SQSMessageModel` in order to be consistent with the name exported from the package index. Again, this is not expected to break anything, and does not affect imports because the class is a default export.

src/models/SQSMessageModel.ts

@@ -3,7 +3,7 @@ import { SQS } from 'aws-sdk';
 /**
  * Message model for SQS.
  */
-export default class Message {
+export default class SQSMessageModel {
   readonly messageId: string;
 
   readonly receiptHandle: string;