Directly add requirements for nbconvert
Directly add requirements for nbconvert

thomasyu888/nbviewer,franblas/beaker-sharing-server,bollwyvl/nbviewer,Jay-Oh-eN/nbviewer,Jay-Oh-eN/nbviewer,twosigma/beaker-sharing-server,iamjakob/nbviewer,iamjakob/nbviewer,AlfiyaZi/nbviewer,Sage-Bionetworks/nbviewer,bollwyvl/nbviewer,twosigma/beaker-sharing-server,franblas/beaker-sharing-server,christophelec/nbviewer,Sage-Bionetworks/nbviewer,twosigma/beaker-sharing-server,imsparsh/nbviewer,twosigma/beaker-sharing-server,roxyboy/nbviewer,thomasyu888/nbviewer,christophelec/nbviewer,franblas/beaker-sharing-server,imsparsh/nbviewer,franblas/beaker-sharing-server,AlfiyaZi/nbviewer,roxyboy/nbviewer