3.0.0

Fixed

• Plain byebug not working when pry-byebug installed.
• post_mortem mode.
• Command history not being saved after regular program termination.
• #54. (Again) calling
  Byebug.start with Timeout.timeout (thanks @zmoazeni).

Added

• Allow disabling post_mortem mode.

Changed

• show commands command for listing history of previous commands now behaves
  like shell's history command.
• show/set history filename is now show/set histfile
• show/set history size is now show/set histsize
• show/set history save is now show/set autosave
• finish semantics, see
  61f9b4d.
• Use per project history file by default.