add a short history description
add a short history description

yasserglez/pymdptoolbox,McCabeJM/pymdptoolbox,yasserglez/pymdptoolbox,McCabeJM/pymdptoolbox,sawcordwell/pymdptoolbox,silgon/pymdptoolbox,sawcordwell/pymdptoolbox,silgon/pymdptoolbox