Comment in documentation is out of date

[billtubbs]

The following comment on the homepage of the documentation is out of date:

It’s already a bit hard to read because of the dot function calls (required because Python does not yet support an operator for matrix multiplication).

This relates to:

K = dot(P, H.T).dot(inv(dot(H, P).dot(H.T) + R))

Since Python 3.5 and NumPy 1.10.0, you can now use the @ operator.