lhs2tex-1.22: CHANGELOG.md

# lhs2tex-1.22 (2018-09-23)

- Compatibility with ghc-8.6.

# lhs2tex-1.21 (2018-09-10)

- Some code refactoring.
- Experimental markdown mode.
- Improved output when using deprecated modes (#59).
- Compatibility with ghc-8.4 (#69).
- Fix in the formatting directives parser (#64).