npm run add-change works only in Node.js 15.x+

[trivikr]

Confirm by changing [ ] to [x] below to ensure that it's a bug:

• I've gone through Developer Guide and API reference
• I've checked AWS Forums and StackOverflow for answers
• I've searched for previous similar issues and didn't find any solution

Describe the bug
npm run add-change works only in Node.js 15.x+

Is the issue in the browser/Node.js?
Node.js

If on Node.js, are you running this on AWS Lambda?
No

Details of the browser/Node.js version
v14.16.1

SDK version number
N/A

To Reproduce (observed behavior)
Run npm run add-change in Node.js 14.x

It will error with:

filename.replaceAll is not a function
Exiting...
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! aws-sdk@2.900.0 add-change: `node ./scripts/changelog/add-change.js`
npm ERR! Exit status 1

Expected behavior
npm run add-change succeeds on supported versions of Node.js during development.

[trivikr]

This happens because change-creator is using replaceAll while sanitizing fileName.

aws-sdk-js/scripts/changelog/change-creator.js

Lines 26 to 28 in 4f79915

	function sanitizeFileName(filename) {
	return filename.replaceAll(/[^a-zA-Z0-9\\.]/g, '-');
	}

The support for String.prototype.replaceAll() was added in V8 8.5 which was released with Node.js 15.x: https://nodejs.org/en/blog/release/v15.0.0/#v8-8-6-35415