Add go dependencies for mdtoc

vendor/github.com/tallclair/mdtoc/README.md

@@ -0,0 +1,53 @@
+# Markdown Table of Contents Generator
+
+`mdtoc` is a utility for generating a table-of-contents for markdown files.
+
+Only github-flavored markdown is currently supported, but I am open to accepting patches to add
+other formats.
+
+# Table of Contents
+
+Generated with `mdtoc --inplace README.md`
+
+<!-- toc -->
+- [Usage](#usage)
+- [Installation](#installation)
+<!-- /toc -->
+
+## Usage
+
+Usage: `mdtoc [OPTIONS] [FILE]...`
+Generate a table of contents for a markdown file (github flavor).
+
+TOC may be wrapped in a pair of tags to allow in-place updates:
+```
+<!-- toc -->
+generated TOC goes here
+<!-- /toc -->
+```
+
+TOC indentation is normalized, so the shallowest header has indentation 0.
+
+**Options:**
+
+`--dryrun` - Whether to check for changes to TOC, rather than overwriting.
+Requires `--inplace` flag. Exit code 1 if there are changes.
+
+`--inplace` - Whether to edit the file in-place, or output to STDOUT. Requires
+toc tags to be present.
+
+`--skip-prefix` - Whether to ignore any headers before the opening toc
+tag. (default true)
+
+For example, with `--skip-prefix=false` the TOC for this file becomes:
+
+```
+- [Markdown Table of Contents Generator](#markdown-table-of-contents-generator)
+- [Table of Contents](#table-of-contents)
+  - [Usage](#usage)
+  - [Installation](#installation)
+```
+
+## Installation
+
+``` go get github.com/tallclair/mdtoc ```