Publish process propagator v0.2.0 (open-telemetry#111)

* Publish process propagator v0.2.0

* Fix docs

propagators/opentelemetry_process_propagator/CHANGELOG.md

@@ -0,0 +1,13 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## v0.2.0
+
+### Added
+
+- Conveniencies for the Task module
+

propagators/opentelemetry_process_propagator/lib/task.ex

@@ -27,20 +27,28 @@ defmodule OpentelemetryProcessPropagator.Task do
     require OpenTelemetry.Tracer
     alias OpentelemetryProcessPropagator.Task
 
-    def untraced_task do
+    def traced_task_with_existing_span do
       Task.async(fn ->
         :ok
       end)
       |> Task.await()
     end
 
-    def traced_task do
+    def traced_task_with_new_span do
       Task.async_with_span(:span_name, %{attributes: %{a: "b"}}, fn ->
         Tracer.set_attribute(:c, "d")
         :ok
       end)
       |> Task.await()
     end
+
+    def traced_task_with_new_linked_span do
+      Task.async_with_linked_span(:span_name, %{attributes: %{a: "b"}}, fn ->
+        Tracer.set_attribute(:c, "d")
+        :ok
+      end)
+      |> Task.await()
+    end
   end
   ```
   """

propagators/opentelemetry_process_propagator/src/opentelemetry_process_propagator.app.src

@@ -1,6 +1,6 @@
 {application, opentelemetry_process_propagator,
  [{description, "Tools for OpenTelemetry context propagation across process boundaries"},
-  {vsn, "0.1.1"},
+  {vsn, "0.2.0"},
   {registered, []},
   {applications,
    [kernel,