Release v5.2

5.2 / 2022-05-28

• Conditionally render "editable" heading classes. Resolves gollum/gollum#1785 (@benjaminwil)
• Improvement: Allow escaping quotations in quoted macro arguments. #406. (@srbaker)
• Improvement: Allow for extended PlantUML types. #413. (@manofstick)
• API Addition: allow defining handlers for specific languages in codeblocks. #410. (@dometto)