chore: update changelog for v0.3.0 release (open-telemetry#127)

Signed-off-by: Alex Boten <[email protected]>

CHANGELOG.md

@@ -2,9 +2,22 @@
 
 ## Unreleased
 
-* Adding initial instrumentation configuration schema
-* Split MetricExporter into PullMetricExporter and PushMetricExporter and ensure only PushMetricExporters can be associated with PeriodicMetricReader [#110](https://github.com/open-telemetry/opentelemetry-configuration/pull/110)
-* Update `attribute_keys` from array to to Include type [#111](https://github.com/open-telemetry/opentelemetry-configuration/pull/111)
+## [v0.3.0] - 2024-05-08
+
+* Add metric producers to meter_provider configuration. [#90](https://github.com/open-telemetry/opentelemetry-configuration/pull/90)
+* Document what configuration options are covered in the schema. [92](https://github.com/open-telemetry/opentelemetry-configuration/pull/92)
+* Remove unnecessary MetricProducer in pull metric reader. [#93](https://github.com/open-telemetry/opentelemetry-configuration/pull/93)
+* Add modeling rule for property name case. [#96](https://github.com/open-telemetry/opentelemetry-configuration/pull/96)
+* adding instrumentation configuration. [#91](https://github.com/open-telemetry/opentelemetry-configuration/pull/91)
+* Add sdk-config.yaml starter template w/ references to env vars. [#76](https://github.com/open-telemetry/opentelemetry-configuration/pull/76)
+* Split MetricExporter into PullMetricExporter and PushMetricExporter and ensure only PushMetricExporters can be associated with PeriodicMetricReader. [#110](https://github.com/open-telemetry/opentelemetry-configuration/pull/110)
+* Define modeling guidance for mismatches with standard env vars, add resource.attribute_list. [#106](https://github.com/open-telemetry/opentelemetry-configuration/pull/106)
+* Update `attribute_keys` from array to to Include type. [#111](https://github.com/open-telemetry/opentelemetry-configuration/pull/111)
+* add tool for config file validation and envvar replacement. [#94](https://github.com/open-telemetry/opentelemetry-configuration/pull/94)
+* add headers_list support, similar to attributes_list. [#122](https://github.com/open-telemetry/opentelemetry-configuration/pull/122)
+* Prefer arrays of name value pairs over objects. [#115](https://github.com/open-telemetry/opentelemetry-configuration/pull/115)
+* stream: update stream configuration to include/exclude. [#118](https://github.com/open-telemetry/opentelemetry-configuration/pull/118)
+* Project tooling to generate example property descriptions. [#104](https://github.com/open-telemetry/opentelemetry-configuration/pull/104)
 
 ## [v0.2.0] - 2024-05-08