update ChangeLog to reflect minor version bump instead of major (#36)

diff --git a/core/nodejs6Action/CHANGELOG.md b/core/nodejs6Action/CHANGELOG.md
index 6fe8f75..2c777a7 100644
--- a/core/nodejs6Action/CHANGELOG.md
+++ b/core/nodejs6Action/CHANGELOG.md
@@ -1,6 +1,6 @@
 # NodeJS 6 OpenWhisk Runtime Container
 
-## 1.9.0
+## 1.8.1
 Change: Update Node.js
 
 Node.js version = 6.14.1
diff --git a/core/nodejs8Action/CHANGELOG.md b/core/nodejs8Action/CHANGELOG.md
index d8eef5a..03aa2d1 100644
--- a/core/nodejs8Action/CHANGELOG.md
+++ b/core/nodejs8Action/CHANGELOG.md
@@ -1,6 +1,6 @@
 # NodeJS 8 OpenWhisk Runtime Container
 
-## 1.6.0
+## 1.5.1
 Change: Update Node.js
 
 Node.js version = 8.11.1