Amend ToC

README.md

@@ -28,7 +28,8 @@ library:
 
 :arrow_forward: [Video from DITA-OT Day 2018](https://youtu.be/MQRli3XICUo)
 
-# Table of Contents
+<details>
+<summary><strong>Table of Contents</strong></summary>
 
 -   [Install](#install)
     -   [Installing DITA-OT](#installing-dita-ot)
@@ -64,6 +65,8 @@ library:
 -   [Contribute](#contribute)
 -   [License](#license)
 
+</details>
+
 # Install
 
 The unit test framework plug-in has been tested against [DITA-OT 3.x](http://www.dita-ot.org/download). It is also