adds stefan to credits.md
adds stefan to credits.md
Alefas/Scalatra,lightvector/scalatra,lzpfmh/scalatra,lightvector/scalatra,seratch/scalatra,Alefas/Scalatra,dozed/scalatra,0xfaded/scalatra,lzpfmh/scalatra,seratch/scalatra,offner/scalatra,offner/scalatra,lloydmeta/scalatra,lightvector/scalatra,dozed/scalatra,dozed/scalatra,lloydmeta/scalatra,seratch/scalatra,0xfaded/scalatra,offner/scalatra,lzpfmh/scalatra,Alefas/Scalatra