Fix case of commands.expanditems

Author: neet

package.json

@@ -83,7 +83,7 @@
       },
       {
         "command": "qiita.expandItems",
-        "title": "%commands.expanditems.title%",
+        "title": "%commands.expandItems.title%",
         "category": "Qiita"
       }
     ],

package.nls.json

@@ -37,7 +37,7 @@
   "commands.editTitle.title": "タイトルを編集",
   "commands.editTitle.success": "タイトルを編集しました",
 
-  "commands.expanditems.title": "さらに読み込む...",
+  "commands.expandItems.title": "さらに読み込む...",
 
   "quickpicks.tagQuickPick.title": "投稿に登録するタグを入力してください",
   "quickpicks.tagQuickPick.placeholder": "例) Rails React Mastodon",