Update readme: Add scalingo one click deploy

README.md

@@ -62,6 +62,8 @@ By default, the script creates `whitelist.txt` and adds the main bridges (see ab
  * to disable main bridges (remove the line)
 
 New bridges are disabled by default, so make sure to check regularly what's new and whitelist what you want !
+
+[![Deploy on Scalingo](https://cdn.scalingo.com/deploy/button.svg)](https://my.scalingo.com/deploy?source=https://github.com/sebsauvage/rss-bridge)
  
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