CREDITS: Add myself as contributor to the Pywikibot project
CREDITS: Add myself as contributor to the Pywikibot project

Added "Alangi Derick" as contributor to CREDITS file as a contributor
to the project. Thanks Xqt :)

Change-Id: I0062e9eb8d831f02f57c3ebddd90244781a330ee

wikimedia/pywikibot-core,wikimedia/pywikibot-core,PersianWikipedia/pywikibot-core