Changes
### Breaking changes
- Query string is now not included in `http.url` in Nette integration and in generic web frameworks tracing.
### Added
- Implement x-datadog-tag propagation and _dd.p.upstream_services #1405
### Changed
- Get rid of ini-ignoring and redundant checking of ddtrace being enabled #1448
- Strip query string from http.url in generic web tracing #1454
- Use internal root spans in Integrations in place of using the legacy API #1383
- Hard-code version in installer, remove --url option, rename it #1463
- Remove generator support on PHP 7 #1464
### Fixed
- Ensure a proper sampling decision is also evaluated when distributed tracing is used #1450
- Fix ObjectKVStore compatibility with throwing autoloaders #1451
- Properly report error for artisan command in Laravel 7+ #1456 (thank you @ls-paul-julien-vauthier)
### Internal changes
- Migrate ZAI tests to use ZAI SAPI harness #1457
- Move ZAI SAPI to root directory #1411 #1443
- ZAI methods on PHP 5: Args and retval #1401
- Implement ZAI Value interface #1453
- Implement ZAI SAPI test harness (catch2) #1455
- Implement ZAI SAPI test fixture (catch2) #1458
- Refactor ZAI SAPI into Tea SAPI, brings various improvements #1462
- Implement ZAI Symbols interface #1452
- Address Sanitizer check for ZAI SAPI - 1459
- Fix ZaiSapi_ROOT path in Makefile #1443