Releasing V1.0.0-rc.6

Author: Yogiraj Awati

CHANGELOG.md

@@ -1,3 +1,17 @@
+Release v1.0.0-rc.6 (2018-09-25)
+================================
+### SDK Breaking changes
+* The default sampling strategy is `CentralizedStrategy` that launches background tasks to poll sampling rules from X-Ray backend. See the new default sampling strategy in more details 
+here: [Link](https://docs.aws.amazon.com/xray/latest/devguide/xray-sdk-go-configuration.html#xray-sdk-go-configuration-sampling)
+* The `ShouldTrace()` function in the `Strategy` interface now takes a `Request` structure for sampling rule matching and returns `Decision` object
+* Updated `aws-sdk-go` version in `glide.yaml` file to `1.15.23`.
+
+### SDK Enhancements
+* Environment variable `AWS_XRAY_DAEMON_ADDRESS` now takes an additional notation in `tcp:127.0.0.1:2000 udp:127.0.0.2:2001` to set TCP and UDP destination separately. By default it assumes a X-Ray daemon listening to both UDP and TCP traffic on 127.0.0.1:2000.
+* Update DefaultSamplingRules.json file. i.e. service_name has been replaced to host and version changed to 2. SDK still supports v1 JSON file.
+* Fix httptrace datarace : [PR #62](https://github.com/aws/aws-xray-sdk-go/pull/62)
+* Fix sub-segment datarace : [PR #61](https://github.com/aws/aws-xray-sdk-go/pull/61)
+
 Release v1.0.0-rc.5 (2018-05-15)
 ================================
 ### SDK Bugs