Update date on man page. 

Update changelog. 

Update version to 0.30.0. 

Revise changelog 

Updated changelog. 

Bump to 0.28.2, update changelog. 

Bump to 0.28.1, update changelog. 

Merge pull request commonmark#222 from PavloKapyshin/master Fix typo

Bump version to 0.27.1, update changelog. 

Improve afl target. Use afl-clang by default. Set default for path.