borgmatic 1.8.7

• #736: Store included configuration files within each backup archive in support of the "config
  bootstrap" action. Previously, only top-level configuration files were stored.
• #798: Elevate specific Borg warnings to errors or squash errors to
• warnings. See the documentation for more information:
  https://torsion.org/borgmatic/docs/how-to/customize-warnings-and-errors/
• #810: SECURITY: Prevent shell injection attacks within the PostgreSQL hook, the MongoDB hook, the
  SQLite hook, the "borgmatic borg" action, and command hook variable/constant interpolation.
• #814: Fix a traceback when providing an invalid "--override" value for a list option.