Update dependencies (#975)

vendor/github.com/gomarkdown/markdown/README.md

@@ -17,6 +17,19 @@ API Docs:
 - https://godoc.org/github.com/gomarkdown/markdown/parser : parser
 - https://godoc.org/github.com/gomarkdown/markdown/html : html renderer
 
+## Users
+
+Some tools using this package:
+
+- https://github.com/MichaelMure/go-term-markdown : markdown renderer for the terminal
+- https://github.com/artyom/mdserver : web server that serves markdown files
+- https://github.com/rsdoiel/mkpage : content management system generating static websites
+- https://github.com/cugu/dashboard : creates a badge dashboard from a yaml file
+- https://github.com/ieyasu/go-bwiki : simple wiki
+- https://github.com/romanyx/mdopen : view markdown files in the default browser
+- https://github.com/ystyle/sqlmanager : a library for manager sql with markdown like beetsql
+- https://gitlab.com/kendellfab/fazer : library for making templates
+
 ## Usage
 
 To convert markdown text to HTML using reasonable defaults:
@@ -295,7 +308,7 @@ implements the following extensions:
 
   Will convert into `<h1 id="id3" class="myclass" fontsize="tiny">Header 1</h1>`.
 
-- **Mmark support**, see <https://mmark.nl/syntax> for all new syntax elements this adds.
+- **Mmark support**, see <https://mmark.miek.nl/post/syntax/> for all new syntax elements this adds.
 
 ## Todo