add new WMs, re-add Xfce (accidentally removed it from list)
Update CHANGELOG

Changelog information came from this command line output:
git log --all --graph --preformat:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset'\n--abbrev-commit --date=relative
Update CHANGELOG
remove trailing whitespace in line 32
Merge pull request #120 from darealshinji/master

add new WMs, re-add Xfce (accidentally removed it from list)