Updated README to include the AlamofireSF twitter handle and security disclosure.

README.md

@@ -911,7 +911,11 @@ Alamofire is named after the [Alamo Fire flower](https://aggie-horticulture.tamu
 
 ## Credits
 
-Alamofire is owned and maintained by the [Alamofire Software Foundation](http://alamofire.org).
+Alamofire is owned and maintained by the [Alamofire Software Foundation](http://alamofire.org). You can follow them on Twitter at [@AlamofireSF](https://twitter.com/AlamofireSF) for project updates and releases.
+
+### Security Disclosure
+
+If you believe you have identified a security vulnerability with Alamofire, you should report it as soon as possible via email to security@alamofire.org. Please do not post it to a public issue tracker.
 
 ## License