HtmlSanitizer Versions Save

#542

Add package README file

Create customizable comment encoding method (fixes #525)

Merge pull request #516 from jerriep/allow-overriding-literal-text-element-encoding

See #494

Fix #483

Fix #483

Fix for https://github.com/mganss/HtmlSanitizer/security/advisories/GHSA-43cp-6p3q-2pc4

Fix #469

Fixes a bug in CSS url() sanitizing (see #411)