Changes
### Added
- Add span.kind tagging #1801, #1843
### Changed
- Change error.msg to error.message #1821
- Change process_id to metrics tag #1826
- Remove libexecinfo on Alpine #1838
- Always interpolate error message placeholders to avoid confusion #1849
### Fixed
- Fix installer name in help output in datadog-setup.php #1829
- Fix #1828: crash when copying an immutable array #1832
- Fix CodeIgniter integration to not depend on CI_Controller class #1835
- (PHP 7) Fix memory leak with custom CURLOPT_READFUNCTION #1841
- Support custom ini names in installer #1846, #1851
- Clear the active closed stack head when resetting the tracer #1853
### Internal changes
- Speed up "Attaching workspace" step in CI #1823
- Improve test suite flakiness & randomized asan #1817
## Profiling (0.12.0)
### Added
- Add configuration to save profiles to disk #1837
### Changed
- Bump libdatadog to 1.0 #1825
- Bump profiling version for release #1848
### Internal changes
- Fix compile time warnings when compiling without features #1819
- Avoid putting .package-cache into the cache, commit Cargo.lock #1852