message: Update README.md
  removed some text that looked like leftovers from previous editing
diff: @@ -73,7 +73,7 @@ Northstar containers are called `NPK`. The NPK format is heavily inspired by the
  Northstar container contains:
  * Root filesystem in a [Squashfs](https://github.com/plougher/squashfs-tools)
  - file system image (optionally compressed) Northstar manifest with container
  + file system image (optionally compressed)
  * Northstar manifest with process configuration and container meta information
  Northstar containers can be created with the Northstar utility
  