npm and node upgrade

Dockerfile

@@ -21,7 +21,7 @@ RUN set -ex \
   done
 
 ENV NPM_CONFIG_LOGLEVEL info
-ENV NODE_VERSION 4.2.2
+ENV NODE_VERSION 6.9.2
 
 RUN \
   cd /tmp && \

README.md

@@ -7,7 +7,7 @@ Dockerfile that generates an image for people who use [Node.js](http://nodejs.or
 
 ## Build image
 
-    $ docker build -t=ruby-nodejs:4.2.2 .
+    $ docker build -t=ruby-nodejs:6.9.2 .
 
 ## What's included
 
@@ -18,7 +18,7 @@ Dockerfile that generates an image for people who use [Node.js](http://nodejs.or
 
 ## Pull image
 
-    $ docker pull shawnzhu/ruby-nodejs:4.2.2
+    $ docker pull shawnzhu/ruby-nodejs:6.9.2
 
 ## Testing
 

circle.yml

@@ -4,7 +4,7 @@ machine:
 dependencies:
   override:
     - docker info
-    - docker build -t shawnzhu/ruby-nodejs:4.2.2 .
+    - docker build -t shawnzhu/ruby-nodejs:6.9.2 .
 test:
   override:
-    - node_version=$(docker run --rm shawnzhu/ruby-nodejs:4.2.2 node -v); [[ $node_version == "v4.2.2" ]]
+    - node_version=$(docker run --rm shawnzhu/ruby-nodejs:6.9.2 node -v); [[ $node_version == "v6.9.2" ]]

spec/dockerfile_spec.rb

@@ -21,11 +21,11 @@
   end
 
   describe command('node -v') do
-    its(:stdout) { should match /4\.2\.2/ }
+    its(:stdout) { should match /6\.9\.2/ }
   end
 
   describe command('npm -v') do
-    its(:stdout) { should match /2\.\d{1,2}\.\d{1,2}/ }
+    its(:stdout) { should match /3\.\d{1,2}\.\d{1,2}/ }
   end
 
   def os_version