stringifying response

Bumps [terser](https://github.com/terser/terser) from 4.3.4 to 4.8.1.
- [Release notes](https://github.com/terser/terser/releases)
- [Changelog](https://github.com/terser/terser/blob/master/CHANGELOG.md)
- [Commits](https://github.com/terser/terser/commits)

---
updated-dependencies:
- dependency-name: terser
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

request/request.js

@@ -95,7 +95,7 @@ module.exports = function($window, oncompletion) {
 						else {
 							var completeErrorResponse = function() {
 								try { message = ev.target.responseText }
-								catch (e) { message = response }
+								catch (e) { message = JSON.stringify(response) }
 								var error = new Error(message)
 								error.code = ev.target.status
 								error.response = response