message: Added picture to isHTMLTag map
  This change will make sure the below error is not seen while unit testing components using <picture> in their template.
  [Vue warn]: Unknown custom element: <picture> - did you register the component correctly? For recursive components, make sure to provide the "name" option.
diff: @@ -11,7 +11,7 @@ export const namespaceMap = {
  export const isHTMLTag = makeMap(
  'html,body,base,head,link,meta,style,title,' +
  'address,article,aside,footer,header,h1,h2,h3,h4,h5,h6,hgroup,nav,section,' +
  - 'div,dd,dl,dt,figcaption,figure,hr,img,li,main,ol,p,pre,ul,' +
  + 'div,dd,dl,dt,figcaption,figure,picture,hr,img,li,main,ol,p,pre,ul,' +
  'a,b,abbr,bdi,bdo,br,cite,code,data,dfn,em,i,kbd,mark,q,rp,rt,rtc,ruby,' +
  's,samp,small,span,strong,sub,sup,time,u,var,wbr,area,audio,map,track,video,' +
  'embed,object,param,source,canvas,script,noscript,del,ins,' +
  