index: simplify `_fetch`

lib/index.js

@@ -278,10 +278,10 @@ export default class Now extends EventEmitter {
     return this._syncAmount;
   }
 
-  async _fetch (_url, opts = {}) {
+  _fetch (_url, opts = {}) {
     opts.headers = opts.headers || {};
     opts.headers.authorization = `Bearer ${this._token}`;
-    return await this._agent.fetch(_url, opts);
+    return this._agent.fetch(_url, opts);
   }
 }