Update hiring readme (was out of date, referencing a job no longer on the site). Text from Zbig, more generic so as not to require regular updates. (#854)

Co-authored-by: Cate Huston <[email protected]>

Author: catehstn

README.md

@@ -3,7 +3,7 @@
 Welcome to our android application. We are excited to engage the community in development, see [CONTRIBUTING.md](CONTRIBUTING.md).
 
 ## We are hiring!
-Are you a talented cross-platform mobile developer? We are looking for a Senior Cross-Platform Engineer to help shape our mobile apps. We embrace diverse perspectives, and seek out passionate, self-motivated people, committed to our shared vision of raising the standard of trust online. Visit our [careers](https://duckduckgo.com/hiring/#open) page to find out more!
+DuckDuckGo is growing fast and we continue to expand our fully distributed team. We embrace diverse perspectives, and seek out passionate, self-motivated people, committed to our shared vision of raising the standard of trust online. If you are a senior software engineer capable in either iOS or Android, visit our [careers](https://duckduckgo.com/hiring/#open) page to find out more about our openings!
 
 ## Building the Project
 We use git submodules and so when you are checking out the app, you'll need to ensure the submodules are initialized properly. You can use the `--recursive` flag when cloning the project to do this.