Fixing a compilation error

Dependencies

• [2] ZPGXYRIH pijul diff: println should really be writeln everywhere
• [3] YDKNUL6B Add `diff --short` that lists changes without showing them
• [4] I52XSRUH Massive cleanup, and simplification
• [*] SXEYMYF7 Fixing the bad changes in history (unfortunately, by rebooting).

Change contents

• replacement in pijul/src/commands/diff.rs at line 160
  [3.5591]→[2.0:37](∅→∅)
  − writeln!("{}", ch)?;
  [3.5591]

  [3.5627]
  + writeln!(stdout, "{}", ch)?;