Changed version to latest since the website is updated continuously (but manually)

Author: rougier

book.rst

@@ -25,7 +25,7 @@
    .. image:: data/nc.large.png
       :width: 40px
 
-   | Version 1.0 - January 2017
+   | Latest version - January 2017
 
    .. image:: https://zenodo.org/badge/73355169.svg
       :target: https://zenodo.org/badge/latestdoi/73355169