OneTuple-0.3: Changelog.md

# 0.3

- Rename `OneTuple` to `Solo`
- Add `Typeable`, `Data`, `MonadZip`, `Eq1`, `Ord1`, `Show1`, `Read1`,
  `Generic` and `Generic1` instances

# 0.2.2.1

- Compatible with GHC-8.6

# 0.2.2

- Add `Semigroup` instances
- Compatible with GHC-8.4