Highlight poly variant

Fixes #30

Author: chenglou

grammars/rescript.tmLanguage.json

@@ -214,13 +214,16 @@
           "name": "variable.function variable.other"
         },
         {
-          "match": "(#)(\\.\\.\\.)?[a-zA-Z][0-9a-zA-Z_]*\\b",
+          "match": "(#)(\\.\\.\\.)?([a-zA-Z][0-9a-zA-Z_]*)\\b",
           "captures": {
             "1": {
               "name": "punctuation.definition.keyword"
             },
             "2": {
               "name": "punctuation.definition.keyword"
+            },
+            "3": {
+              "name": "variable.function variable.other"
             }
           }
         }