Support for comment highlighting

Client/syntaxes/upsilon.tmLanguage.json

@@ -77,6 +77,10 @@
     {
       "match": "\\b([a-zA-Z_][a-zA-Z0-9_]*)\\b",
       "name": "variable"
+    },
+    {
+      "match": "(--.*)",
+      "name": "comment"
     }
   ]
 }