fix(README): getInstallationOctokit() doesn't need destructuring (#2257)

getInstallationOctokit doesn't need destructuring

Author: gimenete

README.md

@@ -351,7 +351,7 @@ For example, to implement the above using `App`
 ```js
 const app = new App({ appId, privateKey });
 const { data: slug } = await app.octokit.rest.apps.getAuthenticated();
-const { octokit } = await app.getInstallationOctokit(123);
+const octokit = await app.getInstallationOctokit(123);
 await octokit.rest.issues.create({
   owner: "octocat",
   repo: "hello-world",