update changelogs for 1.15.0 release (#123)

diff --git a/core/swift42Action/CHANGELOG.md b/core/swift42Action/CHANGELOG.md
index da7363d..89bbdbb 100644
--- a/core/swift42Action/CHANGELOG.md
+++ b/core/swift42Action/CHANGELOG.md
@@ -20,7 +20,8 @@
 # Apache OpenWhisk Swift 4.2 Runtime Container
 
 ## 1.15.0
-  - Move from golang:1.12 to golang:1.15 to build the runtime proxy.
+  - Move from golang:1.12 to golang:1.15 to build the runtime proxy. (#121)
+  - Build proxy from openwhisk-runtime-go 1.16.0 release (#122)
 
 ## 1.14.0
   - Support for __OW_ACTION_VERSION (openwhisk/4761)
diff --git a/core/swift51Action/CHANGELOG.md b/core/swift51Action/CHANGELOG.md
index 0a58825..a4fe92d 100644
--- a/core/swift51Action/CHANGELOG.md
+++ b/core/swift51Action/CHANGELOG.md
@@ -20,7 +20,9 @@
 # Apache OpenWhisk Swift 5.1 Runtime Container
 
 ## 1.15.0
-  - Move from golang:1.12 to golang:1.15 to build the runtime proxy.
+  - Update Swift 5.1 image to Swift 5.1.5 (#120)
+  - Move from golang:1.12 to golang:1.15 to build the runtime proxy (#121)
+  - Build proxy from openwhisk-runtime-go 1.16.0 release (#122)
 
 ## 1.14.0
  - Initial Release