update nodejs 6 & 8 to latest security patch (#60)

diff --git a/core/nodejs6Action/CHANGELOG.md b/core/nodejs6Action/CHANGELOG.md
index c5e7c3c..279d777 100644
--- a/core/nodejs6Action/CHANGELOG.md
+++ b/core/nodejs6Action/CHANGELOG.md
@@ -19,6 +19,11 @@
 
 # NodeJS 6 OpenWhisk Runtime Container
 
+## 1.9.2
+Change: Update Node.js
+
+Node.js version = 6.14.3
+
 ## 1.9.1
 Change: Update Node.js
 
diff --git a/core/nodejs6Action/Dockerfile b/core/nodejs6Action/Dockerfile
index b381111..c725e60 100644
--- a/core/nodejs6Action/Dockerfile
+++ b/core/nodejs6Action/Dockerfile
@@ -18,7 +18,7 @@
 FROM nodejsactionbase
 
 # based on https://github.com/nodejs/docker-node
-ENV NODE_VERSION 6.14.2
+ENV NODE_VERSION 6.14.3
 RUN curl -SLO "https://nodejs.org/dist/v$NODE_VERSION/node-v$NODE_VERSION-linux-x64.tar.gz" \
   && tar -xzf "node-v$NODE_VERSION-linux-x64.tar.gz" -C /usr/local --strip-components=1 \
   && rm "node-v$NODE_VERSION-linux-x64.tar.gz"
diff --git a/core/nodejs8Action/CHANGELOG.md b/core/nodejs8Action/CHANGELOG.md
index f8c32ce..8533ef1 100644
--- a/core/nodejs8Action/CHANGELOG.md
+++ b/core/nodejs8Action/CHANGELOG.md
@@ -19,6 +19,11 @@
 
 # NodeJS 8 OpenWhisk Runtime Container
 
+## 1.6.2
+Change: Update Node.js
+
+Node.js version = 8.11.3
+
 ## 1.6.1
 Change: Update Node.js
 
diff --git a/core/nodejs8Action/Dockerfile b/core/nodejs8Action/Dockerfile
index 8ee5d30..3f56b96 100644
--- a/core/nodejs8Action/Dockerfile
+++ b/core/nodejs8Action/Dockerfile
@@ -15,7 +15,7 @@
 # limitations under the License.
 #
 
-FROM node:8.11.2
+FROM node:8.11.3
 RUN apt-get update && apt-get install -y \
     imagemagick \
     unzip \