fixed AT finding, future proofed for 1.8
fixed AT finding, future proofed for 1.8

killjoy1221/ForgeGradle,simon816/ForgeGradle,clienthax/ForgeGradle,kenzierocks/ForgeGradle,RX14/ForgeGradle,Barteks2x/ForgeGradle,PaperMC/PaperGradle,nallar/ForgeGradle,kashike/ForgeGradle,matthewprenger/ForgeGradle