Fix typo in readme.

Author: inf3rnus

README.md

@@ -41,7 +41,7 @@ Here's a quick example of usage:
 ```ts
 import { TwitterApi } from 'twitter-api-v2';
 
-// Instanciate with desired auth type (here's Bearer v2 auth)
+// Instantiate with desired auth type (here's Bearer v2 auth)
 const twitterClient = new TwitterApi('<YOUR_APP_USER_TOKEN>');
 
 // Tell typescript it's a readonly app