update contacts

Author: Masiukevich Maksim

.github/CONTRIBUTING.md

@@ -31,9 +31,10 @@ The following tests must pass before we will accept a pull request. If any of th
 ```bash
 composer tests
 ```
-## Communication Channels
+### Communication Channels
 You can find help and discussion in the following places:
 * [Telegram chat (RU)](https://t.me/php_service_bus)
+* [Twitter](https://twitter.com/PhpBus)
 * Create issue [https://github.com/php-service-bus/service-bus/issues](https://github.com/php-service-bus/service-bus/issues)
 
 ## Security

README.md

@@ -12,9 +12,10 @@ This component is part of the [PHP Service Bus](https://github.com/php-service-b
 ## Contributing
 Contributions are welcome! Please read [CONTRIBUTING](.github/CONTRIBUTING.md) for details.
 
-## Communication Channels
+### Communication Channels
 You can find help and discussion in the following places:
 * [Telegram chat (RU)](https://t.me/php_service_bus)
+* [Twitter](https://twitter.com/PhpBus)
 * Create issue [https://github.com/php-service-bus/service-bus/issues](https://github.com/php-service-bus/service-bus/issues)
 
 ## License