Unify the Added sections of the unreleased changes (#1580)

CHANGELOG.md

@@ -10,7 +10,10 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 ### Added
 
+- Added `resource.Default()` for use with meter and tracer providers. (#1507)
 - AttributePerEventCountLimit and AttributePerLinkCountLimit for SpanLimits. (#1535)
+- Added `Keys()` method to `propagation.TextMapCarrier` and `propagation.HeaderCarrier` to adapt `http.Header` to this interface. (#1544)
+- Added `code` attributes to `go.opentelemetry.io/otel/semconv` package. (#1558)
 
 ### Changed
 
@@ -22,12 +25,6 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 - Vendor the Jaeger exporter's dependency on Apache Thrift. (#1551)
 - Stagger timestamps in exact aggregator tests. (#1569)
 
-### Added
-
-- Added `resource.Default()` for use with meter and tracer providers. (#1507)
-- Added `Keys()` method to `propagation.TextMapCarrier` and `propagation.HeaderCarrier` to adapt `http.Header` to this interface. (#1544)
-- Added `code` attributes to `go.opentelemetry.io/otel/semconv` package. (#1558)
-
 ### Removed
 
 - Removed attempt to resample spans upon changing the span name with `span.SetName()`. (#1545)