Preping v1.6.0-rc.2 release.

Author: bexxmodd

CHANGELOG/1.6-CHANGELOG.md

@@ -4,6 +4,7 @@
 
 - [v1.6 Changelog](#v16-changelog)
   - [Table of Content](#table-of-content)
+- [v1.6.0-rc.2](#v160-rc2)
 - [v1.6.0-rc.1](#v160-rc1)
   - [Major Changes Since v1.5.1](#major-changes-since-v151)
     - [GEP \& API Graduation](#gep--api-graduation)
@@ -16,6 +17,18 @@
     - [Changed](#changed)
     - [Removed](#removed)
 
+# v1.6.0-rc.2
+
+## Major Changes Since v1.6.0-rc.1
+
+### Bug or Regression
+
+* ⚠️ Breaking Change: TLS must now be configured for listeners using the HTTPS protocol. (#4985, @snorwin)
+
+### Test & Conformance
+* The GRPCRouteWeight conformance test now sends its distribution-sampling requests through the injectable Options.GRPCClient instead of a hardcoded DefaultClient, allowing implementations that supply a custom gRPC client to run it. (#5004, @lexfrei)
+* The HTTPRouteRequestPercentageMirror conformance test now derives its acceptance band from the binomial standard deviation instead of a flat ±15% relative tolerance, removing sampling-variance flakes at low mirror percentages. (#5005, @lexfrei)
+
 # v1.6.0-rc.1
 
 ## Major Changes Since v1.5.1