Fix: vue/no-invalid-v-for shouldn't catch slots (fixes #65)(#68)

* =#65 - vue/no-invalid-v-for shouldn't catch slots
* Add missing valid html5 tags
see https://developer.mozilla.org/en-US/docs/Web/HTML/Element

Author: armano2

lib/utils/html-elements.json

@@ -1 +1 @@
-["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","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","caption","col","colgroup","table","thead","tbody","td","th","tr","button","datalist","fieldset","form","input","label","legend","meter","optgroup","option","output","progress","select","textarea","details","dialog","menu","menuitem","summary","content","element","shadow","template"]
+["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","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","caption","col","colgroup","table","thead","tbody","tfoot","td","th","tr","button","datalist","fieldset","form","input","label","legend","meter","optgroup","option","output","progress","select","textarea","details","dialog","menu","menuitem","summary","content","element","shadow","template","slot","blockquote","iframe","noframes","picture"]

tests/lib/rules/no-invalid-v-for.js

@@ -74,6 +74,10 @@ tester.run('no-invalid-v-for', rule, {
     {
       filename: 'test.vue',
       code: '<template><div><template v-for="x in list"><div></div></template></div></template>'
+    },
+    {
+      filename: 'test.vue',
+      code: '<template v-for="x of list"><slot name="item" /></template>'
     }
   ],
   invalid: [