Update changelogs for 0.2a0 release (#253)

Author: c24t

ext/opentelemetry-ext-azure-monitor/CHANGELOG.md

@@ -2,7 +2,14 @@
 
 ## Unreleased
 
-## 0.1a.0
+## 0.2a0
+
+Released 2019-10-29
+
+- Updates for core library changes
+
+## 0.1a0
+
 Released 2019-09-30
 
 - Initial release

ext/opentelemetry-ext-http-requests/CHANGELOG.md

@@ -2,7 +2,14 @@
 
 ## Unreleased
 
-## 0.1a.0
+## 0.2a0
+
+Released 2019-10-29
+
+- Updates for core library changes
+
+## 0.1a0
+
 Released 2019-09-30
 
 - Initial release

ext/opentelemetry-ext-jaeger/CHANGELOG.md

@@ -0,0 +1,9 @@
+# Changelog
+
+## Unreleased
+
+## 0.2a.0
+
+Released 2019-10-29
+
+- Initial release

ext/opentelemetry-ext-opentracing-shim/CHANGELOG.md

@@ -0,0 +1,9 @@
+# Changelog
+
+## Unreleased
+
+## 0.2a.0
+
+Released 2019-10-29
+
+- Initial release

ext/opentelemetry-ext-wsgi/CHANGELOG.md

@@ -2,7 +2,14 @@
 
 ## Unreleased
 
-## 0.1a.0
+## 0.2a0
+
+Released 2019-10-29
+
+- Updates for core library changes
+
+## 0.1a0
+
 Released 2019-09-30
 
 - Initial release

opentelemetry-api/CHANGELOG.md

@@ -1,9 +1,22 @@
 # Changelog
 
 ## Unreleased
-- Initial release
 
-## 0.1a.0
+## 0.2a0
+
+Released 2019-10-29
+
+- W3C TraceContext fixes and compliance tests
+  ([#228](https://github.com/open-telemetry/opentelemetry-python/pull/228))
+- Multiple metrics API changes
+- Multiple tracing API changes
+- Multiple context API changes
+- Sampler API
+  ([#225](https://github.com/open-telemetry/opentelemetry-python/pull/225))
+- Multiple bugfixes and improvements
+
+## 0.1a0
+
 Released 2019-09-30
 
 - Initial release

opentelemetry-sdk/CHANGELOG.md

@@ -2,7 +2,20 @@
 
 ## Unreleased
 
-## 0.1a.0
+## 0.2a0
+
+Released 2019-10-29
+
+- W3C TraceContext fixes and compliance tests
+  ([#228](https://github.com/open-telemetry/opentelemetry-python/pull/228))
+- Multiple metrics SDK changes
+- Multiple tracing SDK changes
+- Sampler SDK
+  ([#225](https://github.com/open-telemetry/opentelemetry-python/pull/225))
+- Multiple bugfixes and improvements
+
+## 0.1a0
+
 Released 2019-09-30
 
 - Initial release