Log Message:
www/ruby-loofah: update to 2.2.0

## 2.2.0 / 2018-02-11

Features:

* Support HTML5 `<main>` tag. #133 (Thanks, @MothOnMars!)
* Recognize HTML5 block elements. #136 (Thanks, @MothOnMars!)
* Support SVG `<symbol>` tag. #131 (Thanks, @baopham!)
* Support for whitelisting CSS functions, initially just `calc` and `rgb`. \ 
#122/#123/#129 (Thanks, @NikoRoberts!)
* Whitelist CSS property `list-style-type`. #68/#137/#142 (Thanks, \ 
@andela-ysanni and @NikoRoberts!)

Bugfixes:

* Properly handle nested `script` tags. #127.

## 2.1.1 / 2017-09-24

Bugfixes:

* Removed warning for unused variable. #124 (Thanks, @y-yagi!)

## 2.1.0 / 2017-09-24

Notes:

* Re-implemented CSS parsing and sanitization using the \ 
{crass}[https://github.com/rgrove/crass] library. #91

Features:

* Added :noopener HTML scrubber (Thanks, @tastycode!)
* Support `data` URIs with the following media types: text/plain, text/css, \ 
image/png, image/gif, image/jpeg, image/svg+xml. #101, #120. (Thanks, \ 
@mrpasquini!)

Bugfixes:

* The :unprintable scrubber now scrubs unprintable characters in CDATA nodes \ 
(like `<script>`). #124
* Allow negative values in CSS properties. Restores functionality that was \ 
reverted in v2.0.3. #91