Merge pull request neetcode-gh#3433 from Tetsuya3850/correct0135Difficulty

Author: felivalencia3

.problemSiteData.json

@@ -5855,7 +5855,7 @@
      "pattern":"Greedy",
      "link":"candy/",
      "video":"1IzCRCcK17A",
-     "difficulty":"Medium",
+     "difficulty":"Hard",
      "code":"135-candy"
   },
   {