document `conceal_code_blocks` in README.md

I set `conceallevel=0` in .vimrc, as well as `g:vim_markdown_conceal =
0` but code fences were still being hidden. I could not find this option
documented anywhere, so I went to the source code. Adding the
`g:vim_markdown_conceal_code_blocks = 0` fixed my problem, and I assume
other people will want to find this in the future.

diff --git a/README.md b/README.md
index b67917a7804edd75ea145ab8bdc4f6352c263ade..9f93316cb94d258372d49a6d661dca13dddf81b2 100644 (file)
--- a/README.md
+++ b/README.md
@@ -179,7 +179,13 @@ set conceallevel=2
 To disable conceal regardless of `conceallevel` setting, add the following to your `.vimrc`:
 
 ```vim
 To disable conceal regardless of `conceallevel` setting, add the following to your `.vimrc`:
 
 ```vim

-let g:vim_markdown_conceal = 0
+let g:vim_markdown_conceal = 0 
+```
+
+Disabling conceal for code fences requires an additional setting:
+
+```vim
+let g:vim_markdown_conceal_code_blocks = 0

 ```
 
 To disable math conceal with LaTeX math syntax enabled, add the following to your `.vimrc`:
 ```
 
 To disable math conceal with LaTeX math syntax enabled, add the following to your `.vimrc`: