remove leftover doctestplus plugin
remove leftover doctestplus plugin

mhvk/numpy,endolith/numpy,charris/numpy,pdebuyl/numpy,anntzer/numpy,mhvk/numpy,pdebuyl/numpy,seberg/numpy,mattip/numpy,numpy/numpy,jakirkham/numpy,endolith/numpy,mattip/numpy,numpy/numpy,anntzer/numpy,mattip/numpy,rgommers/numpy,jakirkham/numpy,seberg/numpy,pdebuyl/numpy,anntzer/numpy,pdebuyl/numpy,rgommers/numpy,numpy/numpy,numpy/numpy,seberg/numpy,anntzer/numpy,charris/numpy,jakirkham/numpy,mattip/numpy,endolith/numpy,charris/numpy,rgommers/numpy,endolith/numpy,mhvk/numpy,jakirkham/numpy,seberg/numpy,rgommers/numpy,charris/numpy,jakirkham/numpy,mhvk/numpy,mhvk/numpy