Add hiring note

Author: ferhatelmas

README.md

@@ -250,3 +250,10 @@ vendor/bin/phpunit --testsuite "Unit Test Suite"
 ### Copyright and License Information
 
 Project is licensed under the [BSD 3-Clause](LICENSE).
+
+## We are hiring!
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+We've recently closed a [$38 million Series B funding round](https://techcrunch.com/2021/03/04/stream-raises-38m-as-its-chat-and-activity-feed-apis-power-communications-for-1b-users/) and we keep actively growing.
+Our APIs are used by more than a billion end-users, and you'll have a chance to make a huge impact on the product within a team of the strongest engineers all over the world.
+
+Check out our current openings and apply via [Stream's website](https://getstream.io/team/#jobs).