Fixed parser warning for \{foo,bar\}

ShellCheck/Parser.hs

@@ -754,7 +754,7 @@ readNormalEscaped = called "escaped char" $ do
     pos <- getPosition
     backslash
     do
-        next <- (quotable <|> oneOf "?*@!+[]")
+        next <- (quotable <|> oneOf "?*@!+[]{}")
         return $ if next == '\n' then "" else [next]
       <|>
         do