TOC entries only generated when online

[dmolesUC]

Steps to reproduce:

1. ensure machine is connected to the Internet.

2. find or write a Markdown document that should generate a good TOC, e.g.
   this gist.

3. use gh-md-toc to generate a TOC for it, to stdout.

   $ ~/bin/gh-md-toc ~/Desktop/burnout.md
   
   Table of Contents
   =================
   
   * ["The Modern Day Sisyphus: \#libtech Burnout and You": <a href="https://twitter\.com/yo\_bj">Becky Yoose</a>](#the-modern-day-sisyphus-libtech-burnout-and-you-becky-yoose)
     * [Abstract &amp; slides](#abstract--slides)
     * [twelve phases of burnout](#twelve-phases-of-burnout)
     * [what's special about \#libtech burnout](#whats-special-about-libtech-burnout)
     * [how to prevent/recover](#how-to-preventrecover)
     * [\.\.\.but this isn't about what the victim should do](#but-this-isnt-about-what-the-victim-should-do)
       * [co\-workers](#co-workers)
       * [managers](#managers)
       * [community](#community)
     * [community privilege](#community-privilege)
   
   Created by [gh-md-toc](https://github.com/ekalinin/github-markdown-toc.go)
   $
   

4. turn off networking

5. attempt to generate the TOC again.

Expected:

• same TOC is generated as in step 3.

Actual:

• only header is generated:

  $ ~/bin/gh-md-toc ~/Desktop/burnout.md
  
  Table of Contents
  =================
  
  
  Created by [gh-md-toc](https://github.com/ekalinin/github-markdown-toc.go)
  $
  

Notes

• MacOS X 10.10.5
• go version go1.6 darwin/amd64
• gh-md-toc 5.0 built from commit 0523167

[ekalinin]

Hey @dmolesUC3

Yeah, it can work only when the Internet is on. As I didn't want to write a parser MD → HTML.
For converting markdown into plain HTML, I use GitHub's API. That's why this tool always needs an internet connection.

[dmolesUC]

OK. It might be nice to get an error message and document that in the README.