CRAN version 0.2.2

Major changes

• Repository transferred from ropenscilabs/allcontributors -> ropensci/allcontributors.

Minor changes

• Fix URL check to only remove 404s; #45, #46 thanks to @maelle
• Replace previous explicit REST API calls with gh; #44 thanks to @maelle
• Fix bug #40 when "Contributors" sub-section title is last line of file; thanks to @sbfnk
• Fix bug #42 with Rest API calls for code contributions; thanks to @maelle