Fix >=? misdetected as operator

Solves part of #35

Author: chenglou

grammars/rescript.tmLanguage.json

@@ -194,7 +194,7 @@
     "operator": {
       "patterns": [
         {
-          "match": "->|\\|\\||&&|\\+\\+|\\*\\*|\\+\\.|\\+|-\\.|-|\\*\\.|\\*|/\\.|/|\\.\\.\\.|\\.\\.|\\|>|===|==|\\^|:=|!|>=|<=",
+          "match": "->|\\|\\||&&|\\+\\+|\\*\\*|\\+\\.|\\+|-\\.|-|\\*\\.|\\*|/\\.|/|\\.\\.\\.|\\.\\.|\\|>|===|==|\\^|:=|!|>=(?! *\\?)|<=",
           "name": "keyword.operator"
         }
       ]