edit README

Author: pastak

README.md

@@ -1,6 +1,10 @@
-# Python Docker Image with OpenCV 3.0
+# NodeJS Docker Image with OpenCV 2.4
 
-This repository contains a Python and OpenCV docker image, for use with [Heroku](http://heroku.com) and the
+This repository contains a NodeJS and OpenCV docker image, for use with [Heroku](http://heroku.com) and the
 [heroku-docker](https://github.com/heroku/heroku-docker) CLI plugin.
 
-[Image available on Dockerhub](https://hub.docker.com/r/sugyan/heroku-python-opencv/).
+[Image available on Dockerhub](https://hub.docker.com/r/pastak/docker-heroku-nodejs-opencv/).
+
+## Why it's not OpenCV 3 ?
+
+Related issue: https://github.com/peterbraden/node-opencv/issues/355