use a cors proxy to avoid rss feed fetch issues

src/index.ts

@@ -10,7 +10,7 @@ export default class Updater {
         }
         
         private async getRawArchive(): Promise<string> {
-                const res = await fetch(`${this.archiveURL}.${this.feedType}`, {
+                const res = await fetch(`https://cors.emaker.limited/?url=${this.archiveURL}.${this.feedType}`, {
                         "mode": "cors"
                 });
                 const text = await res.text();