Update html.yaml by adding support for dialog tags (zyedidia#3255)

Another relatively new tag but commonly used

Author: frabjous

runtime/syntax/html.yaml

@@ -8,7 +8,7 @@ rules:
     - preproc: "<!(?i)(DOCTYPE html.*)>"
     # Opening tag
     - symbol.tag:
-        start: "<(a|abbr|acronym|address|applet|area|article|aside|audio|b|base|bdi|bdo|big|blockquote|body|br|button|canvas|caption|center|cite|code|col|colgroup|command|datalist|dd|del|details|dfn|dir|div|dl|dt|em|embed|fieldset|figcaption|figure|font|footer|form|frame|frameset|h[1-6]|head|header|hgroup|hr|html|i|iframe|img|input|ins|kbd|keygen|label|legend|li|link|map|main|mark|menu|meta|meter|nav|noframes|noscript|object|ol|optgroup|option|output|p|param|pre|progress|q|rp|rt|ruby|s|samp|section|select|small|source|span|strike|strong|sub|summary|sup|table|tbody|td|textarea|tfoot|th|thead|time|title|tr|track|tt|u|ul|var|video|wbr)\\b"
+        start: "<(a|abbr|acronym|address|applet|area|article|aside|audio|b|base|bdi|bdo|big|blockquote|body|br|button|canvas|caption|center|cite|code|col|colgroup|command|datalist|dd|del|details|dfn|dialog|dir|div|dl|dt|em|embed|fieldset|figcaption|figure|font|footer|form|frame|frameset|h[1-6]|head|header|hgroup|hr|html|i|iframe|img|input|ins|kbd|keygen|label|legend|li|link|map|main|mark|menu|meta|meter|nav|noframes|noscript|object|ol|optgroup|option|output|p|param|pre|progress|q|rp|rt|ruby|s|samp|section|select|small|source|span|strike|strong|sub|summary|sup|table|tbody|td|textarea|tfoot|th|thead|time|title|tr|track|tt|u|ul|var|video|wbr)\\b"
         end: ">"
         rules:
           - identifier: "\\b(placeholder|style|alt|bgcolor|height|href|id|(aria|data)\\-.+|label|longdesc|name|on(click|focus|load|mouseover)|size|span|src|target|type|value|width|class|charset|content|rel|integrity|crossorigin|for|onsubmit|lang|role)\\b"
@@ -34,7 +34,7 @@ rules:
 
     # Closing tag
     - symbol.tag:
-        start: "</(a|abbr|acronym|address|applet|area|article|aside|audio|b|base|bdi|bdo|big|blockquote|body|br|button|canvas|caption|center|cite|code|col|colgroup|command|datalist|dd|del|details|dfn|dir|div|dl|dt|em|embed|fieldset|figcaption|figure|font|footer|form|frame|frameset|h[1-6]|head|header|hgroup|hr|html|i|iframe|img|input|ins|kbd|keygen|label|legend|li|link|map|main|mark|menu|meta|meter|nav|noframes|noscript|object|ol|optgroup|option|output|p|param|pre|progress|q|rp|rt|ruby|s|samp|section|select|small|source|span|strike|strong|sub|summary|sup|table|tbody|td|textarea|tfoot|th|thead|time|title|tr|track|tt|u|ul|var|video|wbr)\\b"
+        start: "</(a|abbr|acronym|address|applet|area|article|aside|audio|b|base|bdi|bdo|big|blockquote|body|br|button|canvas|caption|center|cite|code|col|colgroup|command|datalist|dd|del|details|dfn|dialog|dir|div|dl|dt|em|embed|fieldset|figcaption|figure|font|footer|form|frame|frameset|h[1-6]|head|header|hgroup|hr|html|i|iframe|img|input|ins|kbd|keygen|label|legend|li|link|map|main|mark|menu|meta|meter|nav|noframes|noscript|object|ol|optgroup|option|output|p|param|pre|progress|q|rp|rt|ruby|s|samp|section|select|small|source|span|strike|strong|sub|summary|sup|table|tbody|td|textarea|tfoot|th|thead|time|title|tr|track|tt|u|ul|var|video|wbr)\\b"
         end: ">"
         rules:
           # Anything in the closing tag is an error