v2.9.1

What's Changed

• Update documentation for v2.9.0 by @igerber in #271
• Add survey theory document (Phase 10a) by @igerber in #273
• Add Wooldridge ETWFE LinkedIn carousel by @igerber in #272
• Add research-grade DGP parameters for survey tutorials by @igerber in #274
• Update survey roadmap: mark 10b shipped, add 10e simulation details by @igerber in #275
• Add R validation for 4 survey-enabled estimators by @igerber in #276
• Revise survey tutorial to show the cost of ignoring survey design by @igerber in #277
• Revise survey theory doc for accuracy and precision by @igerber in #278
• Release v2.9.1 by @igerber in #279

Full Changelog: v2.9.0...v2.9.1