character support in table of contents

[arcturus140]

Current behavior

Link in TOC does not work for space + slash + space in title

Steps to reproduce

1. create new note
2. add markdown
3. navigate throuhg TOC

Markdown:

# Table of Contents

<!-- toc -->

- [Hello World](#Hello-World)
- [Hello / World](#Hello--World)

<!-- tocstop -->

# Hello World

# Hello / World

# Hello + World

# Hello & World

Environment

• Version : 0.11.11
• OS Version and name : 16.04 Ubuntu

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[daiyam]

It's a duplicate of #2582

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