Features and improvement in no special order:

1. Stability improvements on the poller (Thanks to Solar designer for help tracking it, idea by Rich Felker, fixed by David Moreno).
2. Performance improvements on onion_log (Zachary Grafton)
3. Many bugs found by clang thread sanitizer and fixed. (Zachary Grafton)
4. Improvements to JSON encode/decode (Thanks to Solar designer for help tracking it, fixed by David Moreno)
5. Undefined behaviour fixes (Zachary Grafton)
6. CPP bindings (David Moreno, Zachary Grafton)
7. Redis sessions (Zachary Grafton)
8. Rework on request parser to allow OCS_YIELD (David Moreno).
9. Overall API improvements (David Moreno)
10. Use of custom low level functions: onion_malloc, onion_free... (Basile Starynkevitch)
11. Bohem GC support (Basile Starynkevitch)
12. Man pages for the tools. (David Moreno)
13. Semantic Versioning.
14. Many small fixes and improvements.