0.1.0.4

• Fix Semigroup instance.
• Implement Monoid instance.

0.1.0.3

• Fix bug in Extend instance.
• Remove Extend instance.
• Add more constructor functions.

0.1.0.2

• _ExitSuccess more polymorphic.

0.1.0.1

• Make _ExitSuccess more polymorphic. It was unnecessarily specialised to ().
• Use NoImplicitPrelude and explicit imports.
• Depend on mmorph and implement instances for MFunctor and MMonad.

0.1.0.0

• This change log starts.
• The initial version of exitcode.