Fix typo in README

This is only true for v1.0 tag

In the installation section, the following part was deprecated since v1.2.0 :

    Copy docker.js and template.js from the index/config folder to the folder you setup for the index app    config files, rename tempalte to local-docker.js. Configuration files stack by a certain order (you can see http://lorenwest.github.io/node-config/latest/).
    Edit local-docker.js to update users stanza.