fix: Change error message thrown with redirect mode set to error (#653)

The original error message does not provide enough information about what went wrong. It simply states a configuration setting.

src/index.js

@@ -125,7 +125,7 @@ export default function fetch(url, opts) {
 				// HTTP fetch step 5.5
 				switch (request.redirect) {
 					case 'error':
-						reject(new FetchError(`redirect mode is set to error: ${request.url}`, 'no-redirect'));
+						reject(new FetchError(`uri requested responds with a redirect, redirect mode is set to error: ${request.url}`, 'no-redirect'));
 						finalize();
 						return;
 					case 'manual':