ECOSYSTEM.md: add wastebin pastebin service (#1065)

Author: matze

ECOSYSTEM.md

@@ -34,6 +34,7 @@ If your project isn't listed here and you would like it to be, please feel free
 - [emojied](https://emojied.net) ([repository](https://github.com/sekunho/emojied)): Shorten URLs to emojis!
 - [CLOMonitor](https://clomonitor.io) ([repository](https://github.com/cncf/clomonitor)): Checks open source projects repositories to verify they meet certain best practices.
 - [Pinging.net](https://www.pinging.net) ([repository](https://github.com/benhansenslc/pinging)): A new way to check and monitor your internet connection.
+- [wastebin](https://github.com/matze/wastebin): A minimalist pastebin service.
 
 [Realworld]: https://github.com/gothinkster/realworld
 [SQLx]: https://github.com/launchbadge/sqlx