message: clarify documented version in website
diff: @@ -4,11 +4,11 @@ Sigma is a JavaScript library dedicated to graph drawing, mainly developed by [@
  ## Overview
  -[sigmajs.org website](http://sigmajs.org) provides a global overview of the project.
  +[sigmajs.org website](http://sigmajs.org) provides a global overview of the sigma.js v1.
  As of version `v2`, `sigma` focuses on the management of graph display: layout, rendering, interaction... The graph model is managed in a separate library called [`graphology`](https://github.com/graphology/graphology), which is packed with convenience methods to manage graph data structures.
  -A set of demo examples contain various use-cases that might help you understand how to use sigma (read further below).
  +A set of demo examples contain various use-cases that might help you understand how to use sigma v2 (read further below).
  ### Status
  