feat: add PHP 8 compatibility (#270)

fix: PHP 7.4 Compatibility Fix (#259)

- fixes `Deprecated: Array and string offset access syntax with curly braces is deprecated in...`

Prepare 0.5.2 (#203)

Prepare 0.5.1 (#193)

Extract exporters (#175)

* Remove Stackdriver/Zipkin exporters. Update README

* Update links. Remove google/cloud-trace dev dep.

* Add suggestions for the other exporters

* Fix url to api docs

* Put the mock_error_log back

* guzzle 5 does not have psr7 as a dependency

* Fix GitHub org link for the exporters

Version bump v0.4.3 (#169)

version bump v0.4.2 (#166)

ExtensionTracer should set traceId on spans (#157)

* Failing test for extension not preserving traceId

* ExtensionTracer correctly sets traceId on returned spans

Prepare PECL 0.2.0 (#155)

* Prepare PECL 0.2.0

* Fix time

Simplify quickstart (#142)

* Simplify silex example for use as quickstart

* Update silex README with updates