small fixes

Author: troolee

README.md

@@ -7,13 +7,13 @@ touch devices.
 
 Inspired by [gridster.js](http://gridster.net). Built with love.
 
-Join gridstack.js on Slack: http://gridstackjs.troolee.com
+Join gridstack.js on Slack: https://gridstackjs.troolee.com
 
-[![Slack Status](https://gridstackjs.troolee.com/badge.svg)](http://gridstackjs.troolee.com)
+[![Slack Status](https://gridstackjs.troolee.com/badge.svg)](https://gridstackjs.troolee.com)
 
 <!-- START doctoc generated TOC please keep comment here to allow auto update -->
 <!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
-**Table of Contents**  *generated with [DocToc](https://github.com/thlorenz/doctoc)*
+**Table of Contents**  *generated with [DocToc](http://doctoc.herokuapp.com/)*
 
 - [Demo](#demo)
 - [Usage](#usage)