Fixes class references for Config class
Fixes class references for Config class

Several references to `\Phinx\Config\Config` have been updated from `\ArrayAccess`, which I presume is a vestigial reference.

curtisgibby/phinx,boedy/phinx,kamioftea/phinx,rquadling/phinx,boedy/phinx,dunknicoll/phinx,BambooHR/phinx-mt,HavokInspiration/phinx,kevbaldwyn/phinx,lornajane/phinx,daniel-gomes-sociomantic/phinx,angelorighi/phinx,PinZhang/phinx,ikagawa/phinx,laurin1/phinx,DeltaPHP/phinx,igormx/phinx,berarma/phinx,channelgrabber/phinx,Stene3/phinx,vitormattos/phinx,castamir/phinx,k10r/phinx,gnugat/phinx,Thamrongsak/phinx,dancryer/phinx,aCodify/phinx,robmorgan/phinx,gerkirill/phinx,t1gor/phinx,dankempster/phinx,jimdoescode/phinx,courtney-miles/phinx,lzpfmh/phinx,aCodify/phinx,stevemarksmonii/phinx