0.9.1

Patch release mainly for #1866.

What's Changed

• Post 0.9.0 work - set vers to 0.9.1-dev* by @chalin in #1864
• 0.9.0 release report updates by @chalin in #1865
• Section-index: ensure .Parent isn't nil by @chalin in #1866
• Release v0.9.1 preparation by @chalin in #1867

Full Changelog: v0.9.0...v0.9.1