add Michael to AUTHORS
add Michael to AUTHORS

jalaziz/validictory,sunlightlabs/validictory,MeilleursAgents/validictory,rhettg/validictory,alonho/validictory,travelbird/validictory,mgrandi/validictory,ahassany/validictory,Lujeni/validictory,soulrebel/validictory,andretw/validmore,stxnext/validictory,dmr/validictory,msabramo/validictory,andrecp/validictory,pombredanne/validictory,brotchie/validictory,enotodden/validictory,ceymard/validictory,nicolaiarocci/validictory