Bump loofah from 2.2.3 to 2.3.1 (#2728)

Bump loofah from 2.2.3 to 2.3.1Bumps [loofah](https://github.com/flavorjones/loofah) from 2.2.3 to 2.3.1.
<details>
<summary>Release notes</summary>

*Sourced from [loofah's releases](https://github.com/flavorjones/loofah/releases).*

> ## 2.3.1 / 2019-10-22
> 
> ### Security
> 
> Address CVE-2019-15587: Unsanitized JavaScript may occur in sanitized output when a crafted SVG element is republished.
> 
> This CVE's public notice is at [flavorjones/loofah#171](https://github-redirect.dependabot.com/flavorjones/loofah/issues/171)
> 
> ## 2.3.0 / 2019-09-28
> 
> ### Features
> 
> * Expand set of allowed protocols to include `tel:` and `line:`. [#104, [#147](https://github-redirect.dependabot.com/flavorjones/loofah/issues/147)]
> * Expand set of allowed CSS functions. [related to [#122](https://github-redirect.dependabot.com/flavorjones/loofah/issues/122)]
> * Allow greater precision in shorthand CSS values. [#149](https://github-redirect.dependabot.com/flavorjones/loofah/issues/149) (Thanks, [@&#8203;danfstucky](https://github.com/danfstucky)!)
> * Allow CSS property `list-style` [#162](https://github-redirect.dependabot.com/flavorjones/loofah/issues/162) (Thanks, [@&#8203;jaredbeck](https://github.com/jaredbeck)!)
> * Allow CSS keywords `thick` and `thin` [#168](https://github-redirect.dependabot.com/flavorjones/loofah/issues/168) (Thanks, [@&#8203;georgeclaghorn](https://github.com/georgeclaghorn)!)
> * Allow HTML property `contenteditable` [#167](https://github-redirect.dependabot.com/flavorjones/loofah/issues/167) (Thanks, [@&#8203;andreynering](https://github.com/andreynering)!)
> 
> 
> ### Bug fixes
> 
> * CSS hex values are no longer limited to lowercase hex. Previously uppercase hex were scrubbed. [#165](https://github-redirect.dependabot.com/flavorjones/loofah/issues/165) (Thanks, [@&#8203;asok](https://github.com/asok)!)
> 
> 
> ### Deprecations / Name Changes
> 
> The following method and constants are hereby deprecated, and will be completely removed in a future release:
> 
> * Deprecate `Loofah::Helpers::ActionView.white_list_sanitizer`, please use `Loofah::Helpers::ActionView.safe_list_sanitizer` instead.
> * Deprecate `Loofah::Helpers::ActionView::WhiteListSanitizer`, please use `Loofah::Helpers::ActionView::SafeListSanitizer` instead.
> * Deprecate `Loofah::HTML5::WhiteList`, please use `Loofah::HTML5::SafeList` instead.
> 
> Thanks to [@&#8203;JuanitoFatas](https://github.com/JuanitoFatas) for submitting these changes in [#164](https://github-redirect.dependabot.com/flavorjones/loofah/issues/164) and for making the language used in Loofah more inclusive.
> 
> 
</details>
<details>
<summary>Changelog</summary>

*Sourced from [loofah's changelog](https://github.com/flavorjones/loofah/blob/master/CHANGELOG.md).*

> ## 2.3.1 / 2019-10-22
> 
> ### Security
> 
> Address CVE-2019-15587: Unsanitized JavaScript may occur in sanitized output when a crafted SVG element is republished.
> 
> This CVE's public notice is at [flavorjones/loofah#171](https://github-redirect.dependabot.com/flavorjones/loofah/issues/171)
> 
> 
> ## 2.3.0 / 2019-09-28
> 
> ### Features
> 
> * Expand set of allowed protocols to include `tel:` and `line:`. [#104, [#147](https://github-redirect.dependabot.com/flavorjones/loofah/issues/147)]
> * Expand set of allowed CSS functions. [related to [#122](https://github-redirect.dependabot.com/flavorjones/loofah/issues/122)]
> * Allow greater precision in shorthand CSS values. [#149](https://github-redirect.dependabot.com/flavorjones/loofah/issues/149) (Thanks, [@&#8203;danfstucky](https://github.com/danfstucky)!)
> * Allow CSS property `list-style` [#162](https://github-redirect.dependabot.com/flavorjones/loofah/issues/162) (Thanks, [@&#8203;jaredbeck](https://github.com/jaredbeck)!)
> * Allow CSS keywords `thick` and `thin` [#168](https://github-redirect.dependabot.com/flavorjones/loofah/issues/168) (Thanks, [@&#8203;georgeclaghorn](https://github.com/georgeclaghorn)!)
> * Allow HTML property `contenteditable` [#167](https://github-redirect.dependabot.com/flavorjones/loofah/issues/167) (Thanks, [@&#8203;andreynering](https://github.com/andreynering)!)
> 
> 
> ### Bug fixes
> 
> * CSS hex values are no longer limited to lowercase hex. Previously uppercase hex were scrubbed. [#165](https://github-redirect.dependabot.com/flavorjones/loofah/issues/165) (Thanks, [@&#8203;asok](https://github.com/asok)!)
> 
> 
> ### Deprecations / Name Changes
> 
> The following method and constants are hereby deprecated, and will be completely removed in a future release:
> 
> * Deprecate `Loofah::Helpers::ActionView.white_list_sanitizer`, please use `Loofah::Helpers::ActionView.safe_list_sanitizer` instead.
> * Deprecate `Loofah::Helpers::ActionView::WhiteListSanitizer`, please use `Loofah::Helpers::ActionView::SafeListSanitizer` instead.
> * Deprecate `Loofah::HTML5::WhiteList`, please use `Loofah::HTML5::SafeList` instead.
> 
> Thanks to [@&#8203;JuanitoFatas](https://github.com/JuanitoFatas) for submitting these changes in [#164](https://github-redirect.dependabot.com/flavorjones/loofah/issues/164) and for making the language used in Loofah more inclusive.
</details>
<details>
<summary>Commits</summary>

- [`83df303`](flavorjones/loofah@83df303) version bump to v2.3.1
- [`e323a77`](flavorjones/loofah@e323a77) Merge pull request [#172](https://github-redirect.dependabot.com/flavorjones/loofah/issues/172) from flavorjones/171-xss-vulnerability
- [`1d81f91`](flavorjones/loofah@1d81f91) update CHANGELOG
- [`0c6617a`](flavorjones/loofah@0c6617a) mitigate XSS vulnerability in SVG animate attributes
- [`a5bd819`](flavorjones/loofah@a5bd819) rufo formatting
- [`1bdf276`](flavorjones/loofah@1bdf276) formatting in README
- [`1908dc2`](flavorjones/loofah@1908dc2) update CHANGELOG with release date
- [`bcbd7b3`](flavorjones/loofah@bcbd7b3) update dev gemspec
- [`f6d4c2d`](flavorjones/loofah@f6d4c2d) version bump to v2.3.0
- [`08fee8c`](flavorjones/loofah@08fee8c) update dev deps
- Additional commits viewable in [compare view](flavorjones/loofah@v2.2.3...v2.3.1)
</details>
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Gemfile.lock

@@ -796,7 +796,7 @@ GEM
       tins (~> 1.6)
     crack (0.4.3)
       safe_yaml (~> 1.0.0)
-    crass (1.0.4)
+    crass (1.0.5)
     csv-safe (1.2.0)
     deep_cloneable (2.4.0)
       activerecord (>= 3.1.0, < 6)
@@ -904,7 +904,7 @@ GEM
     lograge-sql (0.3.0)
       activerecord (>= 4, < 6.0)
       lograge (~> 0.4)
-    loofah (2.2.3)
+    loofah (2.3.1)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     lumberjack (1.0.13)