### Added
- Add container id header to http transport (Container Tagging) - #552
- Attach exceptions to spans in new API #548
### Changed
- Migrate PDO integration to sandbox API #538
- Migrate Eloquent integration to sandbox API #559
- Migrate memcached integration to sandbox API #578
- Migrate elasticsearch integration to sandbox API #562
### Fixed
- Predis integration for clusters #574 (thank you @RaoulMeyer!)
- Avoid reserved word "fn" #543
- Fix ZTS builds, remove COMPAT_CTX_* #544
- Curl headers are overwritten when using `curl_copy_handle` function #502
- Correctly treat class names as case insensitive #571
- Static keyword handling #576
- Improve sandboxing of request init hook #583
- Make PHP API check more specific #590 (thank you @iedsapala!)