Add new line at the end

Author: ThomsonTan

exporters/etw/README.md

@@ -13,4 +13,4 @@ Windows Event Tracing infrastructure is available to any vendor or application
 being deployed on Windows.
 
 It is recommended to consume this exporter via
-[vcpkg](https://vcpkg.io/en/package/opentelemetry-cpp).
+[vcpkg](https://vcpkg.io/en/package/opentelemetry-cpp).