Make sure numpy gets upgraded on Travis
Make sure numpy gets upgraded on Travis

walshjon/openmc,amandalund/openmc,wbinventor/openmc,liangjg/openmc,liangjg/openmc,shikhar413/openmc,smharper/openmc,shikhar413/openmc,amandalund/openmc,smharper/openmc,wbinventor/openmc,smharper/openmc,paulromano/openmc,mit-crpg/openmc,smharper/openmc,walshjon/openmc,liangjg/openmc,paulromano/openmc,paulromano/openmc,shikhar413/openmc,paulromano/openmc,walshjon/openmc,mit-crpg/openmc,amandalund/openmc,mit-crpg/openmc,amandalund/openmc,wbinventor/openmc,walshjon/openmc,mit-crpg/openmc,shikhar413/openmc,wbinventor/openmc,liangjg/openmc