update branch from remote master (as in Github Desktop)

Github desktop has a nice feature that I miss in sourcetree.  it is the ability to update my branch from the remote master.  Currently in soucetree I need to switch to the master,  update the master, switch back to the branch and the merge my locally updated master into the branch.  This is quite painful for a workflow which needs to be done often.  This is a 1 click operation in Github desktop.