Update ChangeLog to include v0.2.0 (#333)

* v0.2.0 added to ChangeLog

* Consolidate OPEP list into list of changes

* Past tense for everything

CHANGELOG.md

@@ -7,10 +7,23 @@ the release.
 
 ## Unreleased
 
-- Replace DistributedContext.GetIterator with GetEntries.
+## v0.2.0 (10-22-2019)
 
-## 0.1.0 (API proposal complete) - 06-21-2019
+- [OTEP-0001](https://github.com/open-telemetry/oteps/blob/master/text/0001-telemetry-without-manual-instrumentation.md) Added Auto-Instrumentation.
+- [OTEP-0002](https://github.com/open-telemetry/oteps/blob/master/text/0002-remove-spandata.md): Removed SpanData interface in favor of Span Start and End options.
+- [OTEP-0003](https://github.com/open-telemetry/oteps/blob/master/text/0003-measure-metric-type.md) Consolidatesd pre-aggregated and raw metrics APIs.
+- [OTEP-0008](https://github.com/open-telemetry/oteps/blob/master/text/0008-metric-observer.md) Added Metrics Observers API.
+- [OTEP-0009](https://github.com/open-telemetry/oteps/blob/master/text/0009-metric-handles.md) Added Metrics Handle API.
+- [OTEP-0010](https://github.com/open-telemetry/oteps/blob/master/text/0010-cumulative-to-counter.md) Rename "Cumulative" to "Counter" in the Metrics API.
+- [OTEP-006](https://github.com/open-telemetry/oteps/blob/master/text/0006-sampling.md) Moved sampling from the API tp the SDK.
+- [OTEP-0007](https://github.com/open-telemetry/oteps/blob/master/text/0007-no-out-of-band-reporting.md) Moved support for out-of-band telemetry from the API to the SDK.
+- [OTEP-0016](https://github.com/open-telemetry/oteps/blob/master/text/0016-named-tracers.md) Added named providers for Tracers and Meters.
+- Added design goals and requirements for a telemetry data exchange protocol.
+- Added a Span Processor interface for intercepting span start and end invocations.
+- Added a Span Exporter interface for processing batches of spans.
+- Replaced DistributedContext.GetIterator with GetEntries.
+- Added clarifications and adjustments to improve cross-language applicability.
 
-### Added
+## v0.1.0 (06-21-2019)
 
-- API proposal for the converged OpenTracing/OpenCensus project is complete.
+- Added API proposal for the converged OpenTracing/OpenCensus project is complete.