pijul: added ChangesNotFound error variant

Dependencies

• [2] SXEYMYF7 Fixing the bad changes in history (unfortunately, by rebooting).

Change contents

• edit in pijul/src/main.rs at line 138
  [2.88054]

  [2.88054]
  + #[error("Changes not found: {:?}", hashes)]

  + ChangesNotFound { hashes: Vec<String> },