opentelemetry 1.0.0RC3

OpenTelemetry auto-instrumentation support extension

https://github.com/open-telemetry/opentelemetry-php-instrumentation

License: Apache 2.0

Changes

opentelemetry 1.0.0RC3
* re-enable blackfire (#103)
* Check observer_class_lookup for NULL in observer callback (#102)
* gitsplit extension dir (#98)