Prepare CHANGELOG.md for v1.5.2 release (#2997)

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## HEAD
 
+## v.1.5.2
+
 * Recommended go version for development: 1.19
   * This is the version used by the cloudbuild presubmits. Using a
     different version can lead to presubmits failing due to unexpected
@@ -16,14 +18,15 @@
   Read/Write transactions, however this functionality is no longer supported by the client
   library.
 
-### Misc
-
-* Bump Go version from 1.17 to 1.19.
-* Updated golangci-lint to v1.51.1 (developers should update to this version)
+### Repo config
+* Enable all lint checks in trillian repo by @mhutchinson in https://github.com/google/trillian/pull/2979
 
 ### Dependency updates
 
 * Bump contrib.go.opencensus.io/exporter/stackdriver from 0.13.12 to 0.13.14 by @samuelattwood in https://github.com/google/trillian/pull/2950
+* Bump Go version from 1.17 to 1.19.
+* Updated golangci-lint to v1.51.1 (developers should update to this version)
+* Update transparency-dev/merkle to v0.0.2
 
 ## v1.5.1