Changed 'parenthesis' setting to 'attribute_style' setting to allow for choice between 'hash' and 'html'

Updated output to correctly display html-style attributes or hash-style attributes. 'attribute_style' setting defaults to hash but can be updated by the user to use html style attributes

autoload/emmet.vim

@@ -1671,7 +1671,7 @@ let s:emmet_settings = {
 \                    ."\t%body\n"
 \                    ."\t\t${child}|\n",
 \        },
-\        'parentheses': '{}',
+\        'attribute_style': 'hash',
 \    },
 \    'slim': {
 \        'indentation': '  ',