fix(updateConfig): properly resolve config relative to cwd (#188)

src/update.ts

@@ -80,7 +80,7 @@ export async function updateConfig(
 
 function _tryResolve(path: string, cwd: string, exts: readonly string[]) {
   return _resolvePath(path, {
-    url: cwd,
+    url: join(cwd, '_index.js'),
     extensions: exts as string[],
   }).catch(() => undefined);
 }