Changes
## Important behavior changes in this release
If you are using `dd_trace`, `dd_trace_function`, or `dd_trace_method` then you need to call these functions before the first invocation of the target e.g. `dd_trace('foo', ...)` should be done before `foo` is called for the first time.
### Changed
- Compile to one single file #840, #874
- Simplify configuration #833, #870
- Refactor module blacklist #852
- Cache that a function is not traced #854, #863
- Simplify spl_autoload_register instrumentation #867
- Use normalized URL as the resource name for curl #869 (thanks, @akdh!)
- Sandbox header and http_response_code #875
### Fixed
- Fix variadic args with empty function signature #872
- Bump phpstan to 0.12 and fix issues #841