Releasing version 2.0.0

Author: LaunchDarklyCI

CHANGELOG.md

@@ -2,5 +2,31 @@
 
 All notable changes to the project will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org).
 
+## [2.0.0] - 2020-09-18
+Initial release of the newer types that will be used in Go SDK 5.0 and above.
+
+### Added:
+- Package `ldlog`, which was formerly a subpackage of `go-server-sdk`.
+- Package `ldlogtest`, containing test helpers for use with `ldlog`.
+- Package `ldreason`, containing `EvaluationReason` and related types that were formerly in `go-server-sdk`.
+- Package `ldtime`, containing `UnixMillisecondTime`.
+- Package `lduser`, containing `User` and related types that were formerly in `go-server-sdk`.
+- Package `jsonstream`, a fast JSON encoding tool that is used internally by the SDK.
+- `ldvalue.OptionalString` now implements `encoding.TextMarshaler` and `encoding.TextUnmarshaler`. This is not used by the Go SDK, but can be helpful when using `OptionalString` in other contexts.
+- `ldvalue.OptionalBool` and `ldvalue.OptionalInt` are analogous to `ldvalue.OptionalString`, representing values that may be undefined without using pointers. These are used in the Go SDK.
+
+### Changed:
+- The minimum Go version is now 1.14.
+- The `User` type is now opaque and immutable; there is no direct access to its fields.
+- The `User` type no longer uses pointers or `interface{}` internally, decreasing the need for heap allocations.
+- Reading a `User` from JSON with `json.Unmarshal` now returns an error if the `key` property is missing or null.
+- `EvaluationDetail.VariationIndex` is now an `OptionalInt` rather than an `int`.
+- `EvaluationReason` is now a struct.
+- This project is now a Go module, although it can still be used from non-module code.
+
+### Removed:
+- In `ldvalue`, there are no longer methods for wrapping an existing `interface{}` value in a `Value`.
+- All deprecated members of types that were moved here from `go-server-sdk` have been removed.
+
 ## [1.0.0] - 2020-02-03
 Initial release. This will be used in versions 4.16.0 and above of the LaunchDarkly Server-Side SDK for Go.