uncaught promises no longer spam console (#134)

src/UncaughtPromiseHandler.ts

@@ -2,6 +2,7 @@ import { handleUnknownError } from "./Netscript/NetscriptHelpers";
 
 export function setupUncaughtPromiseHandler(): void {
   window.addEventListener("unhandledrejection", (e) => {
+    e.preventDefault();
     handleUnknownError(
       e.reason,
       null,