secrets: fix rename

lib/secrets.js

@@ -73,11 +73,11 @@ export default class Secrets extends Now {
   rename (nameOrId, newName) {
     return this.retry(async (bail, attempt) => {
       if (this._debug) console.time(`> [debug] #${attempt} PATCH /secrets/${nameOrId}`);
-      const res = await this._fetch('/secrets', {
+      const res = await this._fetch(`/secrets/${nameOrId}`, {
         method: 'PATCH',
-        body: JSON.stringify({
+        body: {
           name: newName
-        })
+        }
       });
       if (this._debug) console.timeEnd(`> [debug] #${attempt} PATCH /secrets/${nameOrId}`);