just a little copy paste error

I just notice that here 

https://advrhumanoids.github.io/XBotInterface/classXBot_1_1KinematicChain.html#adca0efb2635f626df7c1138f188ff41b

if you go in the details of the function : 

void XBot::KinematicChain::getEffortLimits(Eigen::VectorXd & tau_max) const

you have as parameters description 'qdot_max' which should be  tau_max.
