added missing close tag for <a-asset-item> (#2549)
added missing close tag for <a-asset-item> (#2549)


ngokevin/aframe,jaxmolina/ar,dmarcos/aframe,darkwing/aframe,chenzlabs/aframe,darkwing/aframe,googlecreativelab/aframe,jaxmolina/ar,RSpace/aframe,aframevr/aframe,wizgrav/aframe,wizgrav/aframe,aframevr/aframe,ngokevin/aframe,mkungla/aframe,mkungla/aframe,dmarcos/aframe,googlecreativelab/aframe,chenzlabs/aframe,RSpace/aframe,weddingdj/aframe,weddingdj/aframe