Update changelog

Author: krnowak

CHANGELOG.md

@@ -13,6 +13,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 - Add the `ReadOnlySpan` and `ReadWriteSpan` interfaces to provide better control for accessing span data. (#1360)
 - `NewGRPCDriver` function returns a `ProtocolDriver` that maintains a single gRPC connection to the collector. (#1369)
 - `NewSplitDriver` for OTLP exporter that allows sending traces and metrics to different endpoints. (#1418)
+- A new HTTP driver for OTLP exporter in `exporters/otlp/otlphttp`. Currently it only supports the binary protobuf payloads. (#1420)
 
 ### Changed
 
@@ -23,6 +24,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 - Remove duplicate checkout from GitHub Actions workflow (#1407)
 - `NewExporter` from `exporters/otlp` now takes a `ProtocolDriver` as a parameter. (#1369)
 - Many OTLP Exporter options became gRPC ProtocolDriver options. (#1369)
+- Moved gRPC driver for OTLP exporter to `exporters/otlp/otlpgrpc`. (#1420)
 
 ### Removed