Merge pull request #28 from line/u-s-2231

Update `@line/liff` to v2.23.1

Author: cola119

Diff for: package.json

@@ -15,7 +15,7 @@
     "lint": "eslint \"src/**/*.{ts,tsx}\""
   },
   "dependencies": {
-    "@line/liff": "2.21.4",
+    "@line/liff": "2.23.1",
     "react": "^17.0.2",
     "react-dom": "^17.0.2"
   },