Update release notes

CHANGELOG.md

@@ -10,6 +10,10 @@ develop
 - Now, AppleScript's script bundles can specify execution mode to enable running the script inside the application Sandbox (thanks to Kaito Udagawa!).
 
 
+
+3.1.3
+--------------------------
+
 ### Improvements
 
 - Optimize script menu updating performance.

CotEditor/CotEditor.help/Contents/Resources/en.lproj/pgs/releasenotes.html

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 </header>
 
 
-<section>
+<!-- <section>
 <h2>New Features</h2>
 
 <ul>
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 		<li>See <a href="about_script_hook.html">Adding scripting hooks for CotEditor scripts</a> from the Help menu &gt; CotEditor Scripting Manual &gt; <a href="about_scripting.html">About Scripting</a> for details.</li>
 		</ul></li>
 </ul>
-</section>
+</section> -->
 
 
 <section>

CotEditor/CotEditor.help/Contents/Resources/ja.lproj/pgs/releasenotes.html

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 </header>
 
 
-<section>
+<!-- <section>
 <h2>新機能</h2>
 
 <ul>
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 		<li>詳細は、ヘルプ &gt; CotEditor スクリプトマニュアル &gt; <a href="about_scripting.html">スクリプトについて</a> から <a href="about_script_execution_model.html">スクリプトフックの追加</a> を参照して下さい。</li>
 		</ul></li>
 </ul>
-</section>
+</section> -->
 
 
 <section>