Update HISTORY.md.
Update HISTORY.md.

theranger/mlpack,ajjl/mlpack,palashahuja/mlpack,darcyliu/mlpack,ranjan1990/mlpack,palashahuja/mlpack,theranger/mlpack,ajjl/mlpack,darcyliu/mlpack,ajjl/mlpack,theranger/mlpack,ranjan1990/mlpack,ranjan1990/mlpack,palashahuja/mlpack,darcyliu/mlpack