Release :gem: 2.3.0
Remove deprecated plugin 'jekyll-projectlist'

My plugin 'jekyll-projectlist' has been replaced by the data file feature in Jekyll 2.0 and thus became obsolete.
Nix that newline. [ci skip]
Merge pull request #2742 from fhemberger/patch-1
Update history to reflect merge of #2742 [ci skip]