Release 3.5.6

[yscik]

Changes proposed in this Pull Request

• Bump versions and update changelog

Testing instructions

• npm install && npm run build
• Add a post with Syntaxhighlighter block or shortcode
• Make sure highlighting works on the frontend
  --
• The only change in this release is Fix escaping issues with HTML entities #160 and a compatibility follow-up fix
  • To test that, add a Syntaxhighlighter block using a previous version of the plugin, then upgrade and check that it's not broken (Breaking change after 3.5.5 - new output text introduced #162 Remove <code> wrapper #163)
  • Also see SyntaxHighlighter Code block: improper encoding/decoding of HTML entities #152 for encoding test cases

[yscik]

Blocked by #176 (#177)

[alexsanford]

Going straight to version 3.6.0.