Release v3.5.0 · vmg/redcarpet

This release mostly ships with bug fixes and tiny improvements.

Improvements

Avoid mutating the options hash passed to a render object (See #663).
Automatically enable the fenced_code_blocks option passing a HTML_TOC object to the Markdown object's constructor since some languages rely on the sharp to comment code (See #451).
Remove the rel and rev attributes from the output generated for footnotes as they don't pass the HTML 5 validation (See #536).
Allow passing Range objects to the nesting_level option to have a higher level of customization for table of contents (See #519):
```
Redcarpet::Render::HTML_TOC.new(nesting_level: 2..5)
```

Fix a segfault rendering quotes using StripDown and the :quote option.
Fix SmartyPants single quotes right after a link. For example:
```
[John](http://john.doe)'s cat
```
Will now properly converts ' to a right single quote (i.e. ’).