<commit_before><commit_msg>Update release notes<commit_after># New Features

- Spruce now has a `(( stringify <REFERENCE> ))` operator! It can turn
  arbitrary yaml datapoints into multi-line strings of yaml data, so you can
  merge your yaml, and eat it too.

  Check out https://github.com/geofffranks/spruce/blob/master/doc/operators.md#-stringify-
  for more details

# Updates

- spruce is now built with golang 1.15
- various depndency updates and changes to the ci build process

# Acknowledgements

This release has been brought to you by @isibeni and @HeavyWombat. Thanks for the features!

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