added require to midpoint example
added require to midpoint example

hepplerj/turf,joshkirk/turf,JJediny/turf,Turfjs/turf,hepplerj/turf,gavioto/turf,dboze/turf,a9261/turf,Vic-thor/turf,SirenHound/turf,gavioto/turf,stev-0/turf,gavioto/turf,dieface/turf,stebogit/turf,jvrousseau/turf,Turfjs/turf,a9261/turf,stev-0/turf,benstoltz/turf,dieface/turf,Vic-thor/turf,dpmcmlxxvi/turf,paladin74/turf,SirenHound/turf,dboze/turf,benstoltz/turf,arkhemlol/turf,hepplerj/turf,JJediny/turf,joshkirk/turf,kotarohara/turf,dboze/turf,kotarohara/turf,Vic-thor/turf,SirenHound/turf,tilemapjp/turf,jvrousseau/turf,hooplert/jesper,ath0mas/turf,benstoltz/turf,hooplert/jesper,paladin74/turf,tilemapjp/turf,hooplert/jesper,stebogit/turf,Turfjs/turf,tilemapjp/turf,stev-0/turf,JJediny/turf,stebogit/turf,paladin74/turf,dpmcmlxxvi/turf,ath0mas/turf,jvrousseau/turf,dpmcmlxxvi/turf,arkhemlol/turf,arkhemlol/turf,a9261/turf,kotarohara/turf,joshkirk/turf,dieface/turf